What is a knobike protuberance of any part, esp. at the end of a bone or cartilage. Note: [See Illust. of Artiodactyla.] called?

capitulum — (Anat.) A knobike protuberance of any part, esp. at the end of a bone or cartilage. Note: [See Illust. of Artiodactyla.]. (Webster's 1913.)

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