外生骨疣; 外生性骨疣
Exostosis \Ex`os*to"sis\, n. [NL., fr. Gr. ?; ? out + ? bone: cf. F ? exostose.] 1. (Med.) Any protuberance of a bone which is not natural; an excrescence or morbid enlargement of a bone. --Coxe. 2. (Bot.) A knot formed upon or in the wood of trees by disease.
exostosis n : a benign outgrowth from a bone (usually covered with cartilage) [also: {exostoses} (pl)]