"capitulum" in the noun sense
1. capitulum, head
a dense cluster of flowers or foliage
"a head of cauliflower"
"a head of lettuce"
2. ear, spike, capitulum
fruiting spike of a cereal plant especially corn
3. capitulum
an arrangement of leafy branches forming the top or head of a tree
Source: WordNet® (An amazing lexical database of English)
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