arroyo (Spanish from Latin)
1. A small steep-sided watercourse or gulch with a nearly flat floor: usually dry except after heavy rains.
2. Etymology: "a watercourse, a dry streambed"; from about 1845, a California word, from American Spanish, from Spanish, "rivulet, small stream"; from Latin arrugia, "shaft" or "pit in a gold mine"; apparently a compound of ad-, "to" + ruga, "wrinkle".
corrugate
1. To fold into parallel ridges and troughs, or to fold something; such as, a sheet of cardboard into parallel ridges and troughs.
2. Etymology: from Latin corrugatus, past participle of corrugare, "to wrinkle"; from com-, "together, with" + rugare. "to wrinkle".
corrugated
Shaped into alternating parallel grooves and ridges; for example, "The surface of the ocean was rippled and corrugated."
corrugation
Formed or shaped into wrinkles, folds, or into alternating ridges and grooves.
corrugator
1. A muscle which contracts the skin of the forehead into wrinkles.
2. A muscle that draws together the skin, causing it to wrinkle.
irrugate
To wrinkle.
ruga (s), rugae (pl)
A fold, crease, ridge, or wrinkle; for example, mucous membrane.
rugae of gallbladder, mucosal folds of the gallbladder
The interlacing folds of the mucosa that produce a honeycomb appearance in the interior of the gallbladder.
ruga gastrica, rugae of the stomach
Characteristic folds of the gastric mucosa; especially, evident when the stomach is contracted.
rugate
Having alternate ridges and depressions; wrinkled.
rugoscopy
The observation and study of the patterns of the grooves, wrinkles, and ridges (rugae) of the palate to identify individual patterns.
rugose
1. Having many wrinkles or creases; ridged or wrinkled; deeply wrinkled.
2. A reference to, or description of, a leaf or other plant part that has a surface of alternating depressions and ridges.
rugosity
A wrinkled state or condition.
rugous, rugose
Wrinkled; marked by wrinkles.
rugulose
Finely and irregularly wrinkled; such as, certain mushroom caps.
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