Noun: ruga
Sample Sentences
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Female: Face subpolished, weakly rugose, rugae somewhat diverging, at sides sparsely and shallowly punctate; […] [1980, Joseph Kenneth Jonathan, The Isotima-complex (Hymenoptera: Ichneumonidae), page 83:]
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the deadly water-snakes coil’d together like the Rugæ of a single great Brain, the gray and even illumination from the Sky [1997, Thomas Pynchon, Mason & Dixon:]
Nouns inflected like ruga
rimoportula,
setula,
semita,
scapha,
sicula,
bistropha,
apertura,
hemidrachma,
zoochlorella,
pseudonavicella,
chartula,
reticula,
fasciola,
pterygomaxillary fossa,
glenoid fossa,
rhamphotheca,
subucula,
synusia,
filopluma,
gonotheca, etc. (List truncated at 20 nouns)
Etymology
1. Etymology tree
2. Proto-Indo-European *h₁roug-h₂-der.
3. Proto-Italic *rougā
4. Latin rūgabor.
5. English ruga
6. Borrowed from Latin rūga (“a crease in the face, wrinkle”).