Anat., etc. a wrinkle, fold, or ridge, as in the lining of the stomach, vagina, or palate: usually used in pl.
Origin of rugaModern Latin ; from Classical Latin 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.