Definition of capitulum
1
: a rounded protuberance of an anatomical part (such as a bone)
2
: a racemose inflorescence (as of the sunflower) with the axis shortened and dilated to form a rounded or flattened cluster of sessile flowers — see inflorescence illustration
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Merriam-Webster unabridged
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Time Traveler for capitulum
The first known use of capitulum was circa 1755
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