n.
Pronunciation: ' rü-g ə
Function: noun
Inflected Form: plural ru · gae \ - ˌ g ī , - ˌ g ē , - ˌ j ē \
Etymology: New Latin, from Latin, wrinkle ― more at CORRUGATE
Date: 1775
: an anatomical fold or wrinkle (as of the gastric mucous membranes) ― usually used in plural