diff --git a/core/modules/parsers/wikiparser/rules/fnprocdef.js b/core/modules/parsers/wikiparser/rules/fnprocdef.js
index 037172c57..34ac6d72d 100644
--- a/core/modules/parsers/wikiparser/rules/fnprocdef.js
+++ b/core/modules/parsers/wikiparser/rules/fnprocdef.js
@@ -3,7 +3,7 @@ title: $:/core/modules/parsers/wikiparser/rules/fnprocdef.js
 type: application/javascript
 module-type: wikirule
 
-Wiki pragma rule for function and procedure definitions
+Wiki pragma rule for function, procedure and widget definitions
 
 ```
 \function name(param:defaultvalue,param2:defaultvalue)
@@ -13,6 +13,10 @@ definition text
 \procedure name(param:defaultvalue,param2:defaultvalue)
 definition text
 \end
+
+\widget $mywidget(param:defaultvalue,param2:defaultvalue)
+definition text
+\end
 ```
 
 \*/
@@ -31,7 +35,7 @@ Instantiate parse rule
 exports.init = function(parser) {
 	this.parser = parser;
 	// Regexp to match
-	this.matchRegExp = /^\\(function|procedure)\s+([^(\s]+)(\(\s*([^)]*)\))?(\s*\r?\n)?/mg;
+	this.matchRegExp = /^\\(function|procedure|widget)\s+([^(\s]+)(\(\s*([^)]*)\))?(\s*\r?\n)?/mg;
 };
 
 /*
@@ -94,6 +98,8 @@ exports.parse = function() {
 		parseTreeNodes[0].isFunctionDefinition = true;
 	} else if(this.match[1] === "procedure") {
 		parseTreeNodes[0].isProcedureDefinition = true;
+	} else if(this.match[1] === "widget") {
+		parseTreeNodes[0].isWidgetDefinition = true;
 	}
 	return parseTreeNodes;
 };
diff --git a/core/modules/widgets/importvariables.js b/core/modules/widgets/importvariables.js
index edea63311..7cbe387b0 100644
--- a/core/modules/widgets/importvariables.js
+++ b/core/modules/widgets/importvariables.js
@@ -57,7 +57,8 @@ ImportVariablesWidget.prototype.execute = function(tiddlerList) {
 						params: parseTreeNode.params,
 						isMacroDefinition: parseTreeNode.isMacroDefinition,
 						isFunctionDefinition: parseTreeNode.isFunctionDefinition,
-						isProcedureDefinition: parseTreeNode.isProcedureDefinition
+						isProcedureDefinition: parseTreeNode.isProcedureDefinition,
+						isWidgetDefinition: parseTreeNode.isWidgetDefinition
 					};
 					if (parseTreeNode.isMacroDefinition || parseTreeNode.isProcedureDefinition) {
 						// Macro definitions can be folded into
diff --git a/core/modules/widgets/setvariable.js b/core/modules/widgets/setvariable.js
index 41a5d95c8..f9e7b5a85 100755
--- a/core/modules/widgets/setvariable.js
+++ b/core/modules/widgets/setvariable.js
@@ -54,6 +54,8 @@ SetWidget.prototype.execute = function() {
 		this.setVariable(this.setName,this.getValue(),this.parseTreeNode.params,undefined,{isFunctionDefinition: true});
 	} else if(this.parseTreeNode.isProcedureDefinition) {
 		this.setVariable(this.setName,this.getValue(),this.parseTreeNode.params,undefined,{isProcedureDefinition: true});
+	} else if(this.parseTreeNode.isWidgetDefinition) {
+		this.setVariable(this.setName,this.getValue(),this.parseTreeNode.params,undefined,{isWidgetDefinition: true});
 	} else {
 		this.setVariable(this.setName,this.getValue());
 	}
diff --git a/core/modules/widgets/transclude.js b/core/modules/widgets/transclude.js
index 940ce814c..7fcc39fac 100755
--- a/core/modules/widgets/transclude.js
+++ b/core/modules/widgets/transclude.js
@@ -185,8 +185,8 @@ TranscludeWidget.prototype.getTransclusionTarget = function() {
 				}
 			}
 			if(parser) {
-				// Add parameters widget for procedures
-				if(srcVariable.isProcedureDefinition) {
+				// Add parameters widget for procedures and custom widgets
+				if(srcVariable.isProcedureDefinition || srcVariable.isWidgetDefinition) {
 					parser = {
 						tree: [
 							{
diff --git a/core/modules/widgets/widget.js b/core/modules/widgets/widget.js
index e0ee547c3..cf32e71c4 100755
--- a/core/modules/widgets/widget.js
+++ b/core/modules/widgets/widget.js
@@ -94,6 +94,7 @@ isMacroDefinition: true if the variable is set via a \define macro pragma (and h
 options includes:
 	isProcedureDefinition: true if the variable is set via a \procedure pragma (and hence should not have variable substitution performed)
 	isFunctionDefinition: true if the variable is set via a \function pragma (and hence should not have variable substitution performed)
+	isWidgetDefinition: true if the variable is set via a \widget pragma (and hence should not have variable substitution performed)
 */
 Widget.prototype.setVariable = function(name,value,params,isMacroDefinition,options) {
 	options = options || {};
@@ -102,7 +103,8 @@ Widget.prototype.setVariable = function(name,value,params,isMacroDefinition,opti
 		params: params,
 		isMacroDefinition: !!isMacroDefinition,
 		isFunctionDefinition: !!options.isFunctionDefinition,
-		isProcedureDefinition: !!options.isProcedureDefinition
+		isProcedureDefinition: !!options.isProcedureDefinition,
+		isWidgetDefinition: !!options.isWidgetDefinition
 	};
 };
 
@@ -434,8 +436,9 @@ Widget.prototype.makeChildWidget = function(parseTreeNode,options) {
 	var self = this;
 	options = options || {};
 	// Check whether this node type is defined by a custom macro definition
-	var variableDefinitionName = "<$" + parseTreeNode.type + ">";
-	if(!parseTreeNode.isNotRemappable && this.variables[variableDefinitionName] && this.variables[variableDefinitionName].value) {
+	var variableDefinitionName = "$" + parseTreeNode.type,
+		variableInfo = this.variables[variableDefinitionName];
+	if(!parseTreeNode.isNotRemappable && variableInfo && variableInfo.value && variableInfo.isWidgetDefinition) {
 		var newParseTreeNode = {
 			type: "transclude",
 			children: [
diff --git a/editions/test/tiddlers/tests/data/genesis-widget/RedefineLet.tid b/editions/test/tiddlers/tests/data/genesis-widget/RedefineLet.tid
index 5f2a70f58..395411dd1 100644
--- a/editions/test/tiddlers/tests/data/genesis-widget/RedefineLet.tid
+++ b/editions/test/tiddlers/tests/data/genesis-widget/RedefineLet.tid
@@ -6,7 +6,7 @@ tags: [[$:/tags/wiki-test-spec]]
 title: Output
 
 \whitespace trim
-\procedure <$let>
+\widget $let
 \whitespace trim
 <$setmultiplevariables $names="[<@params>jsonindexes[]]" $values="[<@params>jsonindexes[]] :map[<@params>jsonget<currentTiddler>addprefix[--]addsuffix[--]]">
 <$slot $name="ts-body"/>
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-ActionWidget.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-ActionWidget.tid
index 62793dbda..3cddb63cf 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-ActionWidget.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-ActionWidget.tid
@@ -13,7 +13,7 @@ title: Actions
 
 \whitespace trim
 <!-- Define the <$action-mywidget> widget by defining a transcludable variable with that name -->
-\procedure <$action-mywidget>(one:'Jaguar')
+\widget $action-mywidget(one:'Jaguar')
 \whitespace trim
 <$action-setfield $tiddler="Result" $field="text" $value=<<one>>/>
 \end
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-Override-Codeblock.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-Override-Codeblock.tid
index 0741e378b..842a92b70 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-Override-Codeblock.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-Override-Codeblock.tid
@@ -16,7 +16,7 @@ title: Output
 title: Definition
 
 \whitespace trim
-\procedure <$codeblock>(code)
+\widget $codeblock(code)
 <$genesis $type="codeblock" $remappable="no" code={{{ [<code>addprefix[£]addsuffix[@]] }}}/>
 \end
 +
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-OverrideTransclude.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-OverrideTransclude.tid
index 15a289da8..7b4a8d8aa 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-OverrideTransclude.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-OverrideTransclude.tid
@@ -17,7 +17,7 @@ title: TiddlerOne
 
 \whitespace trim
 <!-- Redefine the <$transclude> widget by defining a transcludable variable with that name -->
-\procedure <$transclude>(one:'Jaguar')
+\widget $transclude(one:'Jaguar')
 \whitespace trim
 	<$text text=<<one>>/>
 	<$slot $name="body">
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-Simple.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-Simple.tid
index 3dadabd03..86d181042 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-Simple.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-Simple.tid
@@ -13,7 +13,7 @@ title: TiddlerOne
 
 \whitespace trim
 <!-- Define the <$mywidget> widget by defining a transcludable variable with that name -->
-\procedure <$mywidget>(one:'Jaguar')
+\widget $mywidget(one:'Jaguar')
 \whitespace trim
 <$text text=<<one>>/>
 <$slot $name="ts-body">
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-TextWidgetOverride.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-TextWidgetOverride.tid
index 53ba3d7e8..0a65533f6 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-TextWidgetOverride.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-TextWidgetOverride.tid
@@ -13,10 +13,10 @@ title: TiddlerOne
 
 \whitespace trim
 <!-- Redefine the <$text> widget by defining a transcludable variable with that name -->
-\procedure <$text>(text:'Jaguar')
+\widget $text(text:'Jaguar')
 \whitespace trim
 <$genesis $type="text" $remappable="no" text=<<text>>/>
-<$set name="<$text>" value="">
+<$set name="$text" value="">
 	<$slot $name="ts-body">
 		Whale
 	</$slot>
diff --git a/editions/test/tiddlers/tests/data/transclude/CustomWidget-VariableAttribute.tid b/editions/test/tiddlers/tests/data/transclude/CustomWidget-VariableAttribute.tid
index 0b5ba9e81..a7e0e62e3 100644
--- a/editions/test/tiddlers/tests/data/transclude/CustomWidget-VariableAttribute.tid
+++ b/editions/test/tiddlers/tests/data/transclude/CustomWidget-VariableAttribute.tid
@@ -13,7 +13,7 @@ title: TiddlerOne
 
 \whitespace trim
 <!-- Redefine the <$mywidget> widget by defining a transcludable variable with that name -->
-\procedure <$mywidget>($variable:'Jaguar')
+\widget $mywidget($variable:'Jaguar')
 \whitespace trim
 <$text text=<<$variable>>/>
 <$slot $name="ts-body">