Resembling, or functioning like, a rib.(adjective)
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Use "riblike" in a sentence
"Too bad the valley did not match the view-bare trees on either side of the road stretched riblike limbs toward them; a clammy, spectral mist rose from stagnant pools of water as they passed through the Beguilers 'swamp."
"A pair of riblike bones, each fastened to portions of fin with strings cut from his former cape, made passable paddles with which to propel the once-living raft."
"It was a different shade of white, however, and the riblike projections which emerged from the pile were not ice crystals."