diff --git a/basis/ui/gadgets/books/books.factor b/basis/ui/gadgets/books/books.factor
index 28cae56de9..ca9aa2d2d2 100644
--- a/basis/ui/gadgets/books/books.factor
+++ b/basis/ui/gadgets/books/books.factor
@@ -26,7 +26,7 @@ M: book model-changed ( model book -- )
 : <empty-book> ( model -- book )
     book new-book ;
 
-M: book pref-dim* ( book -- dim ) children>> pref-dims max-dim ;
+M: book pref-dim* ( book -- dim ) children>> pref-dims max-dims ;
 
 M: book layout* ( book -- )
     [ children>> ] [ dim>> ] bi '[ _ >>dim drop ] each ;
diff --git a/basis/ui/gadgets/gadgets-docs.factor b/basis/ui/gadgets/gadgets-docs.factor
index 606cf1a9af..5585c36f31 100644
--- a/basis/ui/gadgets/gadgets-docs.factor
+++ b/basis/ui/gadgets/gadgets-docs.factor
@@ -38,11 +38,11 @@ HELP: pick-up
 { $values { "point" "a pair of integers" } { "gadget" gadget } { "child/f" { $maybe gadget } } }
 { $description "Outputs the child at a point in the gadget's co-ordinate system. This word recursively descends the gadget hierarchy, and so outputs the deepest child." } ;
 
-HELP: max-dim
+HELP: max-dims
 { $values { "dims" "a sequence of pairs of integers" } { "dim" "a pair of integers" } }
 { $description "Outputs the smallest dimensions of a rectangle which can fit all the dimensions in the sequence." } ;
 
-{ pref-dims max-dim dim-sum } related-words
+{ pref-dims max-dims sum-dims } related-words
 
 HELP: each-child
 { $values { "gadget" gadget } { "quot" { $quotation "( child -- )" } } }
@@ -88,7 +88,7 @@ HELP: prefer
 { $values { "gadget" gadget } }
 { $contract "Resizes the gadget to assume its preferred dimensions." } ;
 
-HELP: dim-sum
+HELP: sum-dims
 { $values { "seq" "a sequence of pairs of integers" } { "dim" "a pair of integers" } }
 { $description "Sums a sequence of dimensions." } ;
 
diff --git a/basis/ui/gadgets/gadgets.factor b/basis/ui/gadgets/gadgets.factor
index 66c026e773..2d79a143dc 100644
--- a/basis/ui/gadgets/gadgets.factor
+++ b/basis/ui/gadgets/gadgets.factor
@@ -87,9 +87,9 @@ M: gadget contains-point? ( loc gadget -- ? )
     [ contains-point? ] with find-last nip
     [ [ loc>> v- ] [ pick-up ] bi ] [ nip ] ?if ;
 
-: max-dim ( dims -- dim ) { 0 0 } [ vmax ] reduce ;
+: max-dims ( dims -- dim ) { 0 0 } [ vmax ] reduce ;
 
-: dim-sum ( seq -- dim ) { 0 0 } [ v+ ] reduce ;
+: sum-dims ( seq -- dim ) { 0 0 } [ v+ ] reduce ;
 
 : each-child ( gadget quot -- )
     [ children>> ] dip each ; inline
diff --git a/basis/ui/gadgets/packs/packs.factor b/basis/ui/gadgets/packs/packs.factor
index b50187904b..8c50d79c2f 100644
--- a/basis/ui/gadgets/packs/packs.factor
+++ b/basis/ui/gadgets/packs/packs.factor
@@ -66,11 +66,11 @@ PRIVATE>
 
 : max-pack-dim ( pack sizes -- dim )
     over align>> +baseline+ eq?
-    [ [ children>> ] dip measure-height 0 swap 2array ] [ nip max-dim ] if ;
+    [ [ children>> ] dip measure-height 0 swap 2array ] [ nip max-dims ] if ;
 
 : pack-pref-dim ( pack sizes -- dim )
     [ max-pack-dim ]
-    [ [ gap-dim ] [ dim-sum ] bi* v+ ]
+    [ [ gap-dim ] [ sum-dims ] bi* v+ ]
     [ drop orientation>> ]
     2tri set-axis ;
 
diff --git a/basis/ui/gadgets/tracks/tracks.factor b/basis/ui/gadgets/tracks/tracks.factor
index 89389485b2..920b797691 100644
--- a/basis/ui/gadgets/tracks/tracks.factor
+++ b/basis/ui/gadgets/tracks/tracks.factor
@@ -39,14 +39,14 @@ TUPLE: track < pack sizes ;
 M: track layout* ( track -- ) dup track-layout pack-layout ;
 
 : track-pref-dims-1 ( track -- dim )
-    [ children>> pref-dims max-dim ]
+    [ children>> pref-dims max-dims ]
     [ pref-dim>> { 0 0 } or ] bi vmax ;
 
 : track-pref-dims-2 ( track -- dim )
     [
         [ children>> pref-dims ] [ normalized-sizes ] bi
         [ dup { 0 f } member? [ 2drop { 0 0 } ] [ v/n ] if ] 2map
-        max-dim [ >fixnum ] map
+        max-dims [ >fixnum ] map
     ] [ gap-dim ] bi v+ ;
 
 M: track pref-dim* ( gadget -- dim )
diff --git a/basis/ui/pens/polygon/polygon.factor b/basis/ui/pens/polygon/polygon.factor
index 2f84d77f1c..7a9bbd1714 100644
--- a/basis/ui/pens/polygon/polygon.factor
+++ b/basis/ui/pens/polygon/polygon.factor
@@ -35,5 +35,5 @@ M: polygon draw-interior
     tri ;
 
 : <polygon-gadget> ( color points -- gadget )
-    [ <polygon> ] [ max-dim ] bi
+    [ <polygon> ] [ max-dims ] bi
     [ <gadget> ] 2dip [ >>interior ] [ >>dim ] bi* ;
diff --git a/basis/ui/ui-docs.factor b/basis/ui/ui-docs.factor
index 9ff0f564a3..0ae5df464d 100644
--- a/basis/ui/ui-docs.factor
+++ b/basis/ui/ui-docs.factor
@@ -270,8 +270,8 @@ ARTICLE: "ui-layout-impl" "Implementing layout gadgets"
     pref-dim
     pref-dims
     prefer
-    max-dim
-    dim-sum
+    max-dims
+    sum-dims
 }
 { $warning
     "When implementing the " { $link layout* } " generic word for a gadget which inherits from another layout, the " { $link children-on } " word might have to be re-implemented as well."