a wrinkle, fold, or ridge, as in the lining of the stomach, vagina, or palate: usually used in pl.
Origin of rugaModern Latin from L, a wrinkle from Indo-European an unverified form rug- from an unverified form werg-, to turn from base an unverified form wer-
nounpl. ru·gae, Biology
often rugas A fold, crease, or wrinkle, as in the lining of the stomach.
Origin of rugaLatin rūga