Ribbed

a.	1.	Furnished or formed with ribs; as, a ribbed cylinder; ribbed cloth.
	2.	(Mining) Intercalated with slate; - said of a seam of coal.

Adj.	1.	ribbed - furnished or strengthened with ribs Antonyms: ribless - having no ribs or no visible ribs
	2.	ribbed - (of the surface of shells) having a rough, rib-like texture Synonyms: costate

canaliculate, canaliculated, chamfered, channeled, corduroy, corduroyed, corrugate, corrugated, costate, crimped, cut, dadoed, engraved, fluted, furrowed, gashed, goffered, gouged, grooved, incised, pleated, rabbeted, rifled, rutted, rutty, scored, scratched, slit, striated, sulcate, sulcated, troughed, wrinkled