Anatomy, Zoology, Botany = ruga, n.

Botany and Zoology. A formation resembling a crest or ridge, on the surface of an organ.

A fold, a ridge, a wrinkle. Usually in plural.

A hollow cylindrical channel in a plant; spec. in Botany the lower united portion of a gamopetalous corolla or gamosepalous calyx; also, a united…

Anything resembling a furrow. Botany.

A similar groove or channel in any material. In Botany: see quot. 1728.

Chiefly in scientific use. A small groove, channel, or ridge; a narrow streak, stripe, or band of distinctive colour, structure, or texture; esp.…

A prominent ridge or line of tissue on the surface of a plant part other than a leaf.

Applied to various structures of the form of a keel or ridge; esp. the median ridge on the mericarp of an umbelliferous fruit.

= striola, n.

Botany. A groove or channel; a sulcus or stria.

A pipe, duct, tube, or tubular cavity, natural or artificial, often used for conveying liquid; spec. a tubular cavity in the body of an animal or…

a keel-like formation, ridging resembling a keel.

One of the folds in the ruminate endosperm of a seed; these folds collectively. Also: the condition of being ruminate. Cf. ruminate, adj.

A small stria.

A small rib (in various senses); spec. any one of a set on the outer surface of a boat, aircraft, etc., used to reduce drag.