Shaped like a crown or having a crown-like projection, especially referring to anatomical structures in the arm and jaw.
From corona (Latin 'crown') + -oid (Greek -eidos, 'resembling'). Used in anatomy since at least the 18th century to describe bone processes that stick up like little crowns.
Your ulna bone (in your forearm) has a coronoid process that sticks up like a tiny crown—this is why ancient anatomists named it that way, and the name stuck for over 300 years!
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