What does rugae mean?
Rulae is the plural of ruga and denotes folds, ridges, or wrinkles in anatomical tissue. Its best-known referents are the gastric rugae, the numerous longitudinal folds in the stomach's inner lining. These folds allow the stomach to accommodate food and expand, and they also contribute to its distinctive internal appearance. Rugae can similarly describe folds in the vaginal lining and in other organs. The term comes directly from Latin and is used chiefly in medical and anatomical contexts. Although it may superficially resemble an ordinary word for creases, rugae has a specialized meaning: it usually refers to the organized folds of a particular tissue rather than to the creases that form incidentally on a surface. In writing, the alternative ligature form rugæ may also be encountered, especially in anatomy texts.
nounAnatomical folds, ridges, or wrinkles, especially the longitudinal folds in the lining of the stomach and other hollow organs. The plural form is used for such folds collectively.
- Folds, ridges, or wrinkles in an anatomical structure, especially the lining of the stomach, vagina, or another hollow organ.
"The stomach's inner lining is marked by prominent rugae that allow it to expand."
"The physician examined the gastric rugae for signs of inflammation."
"The vaginal rugae became more prominent during childbirth."
This entry is already plural. The singular form is ruga.
"The rugae became more pronounced as the stomach filled."
The stomach's famous rugae are not merely wrinkles: they are expandable folds that help it stretch after a large meal.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does rugae come from?
Rugae comes from Latin ruga, meaning “wrinkle” or “fold,” with rugae serving as its Latin plural. The plural was adopted into English as part of the vocabulary of anatomy and medicine. English derivatives such as rugose, rugosity, and rugate continue the same Latin stem and refer to wrinkling, ridging, or a wrinkled surface.
Related word forms
How rugae is actually used
This is technical anatomical vocabulary and is rarely used in general conversation. In medical English, rugae is typically treated as a Latin plural, while ruga is its singular.
Easily confused with rugae
A ruga is one fold or ridge; rugae is the plural form referring to several.