tubercle
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http://purl.obolibrary.org/obo/UBERON_0005813
A round nodule, small eminence, or warty outgrowth found on bones, skin, or within the lungs in tuberculosis. They are also found on the leading edge of Humpback Whale's flippers, improving fluid flow over the flipper's surface[WP]. [ http://en.wikipedia.org/wiki/Tubercle_(anatomy) ]