sesamoid

详细解释:a. 芝麻形的, 籽骨的
n. 籽骨
【医】 籽样的, 种子样的; 籽骨

英语解释：

名词 sesamoid:

any of several small round bones formed in a tendon where it passes over a joint同义词：sesamoid bone, os sesamoideum