noun, plural capitula [kuh-pich-uh-luh] .
Biology. any globose or knoblike part, as a flower head or the head of a bone.

1715–25; < Latin, equivalent to capit- (stem of caput) head + -ulum, neuter of -ulus -ule Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
capitulum (kəˈpɪtjʊləm)
n , pl -la
1.  a racemose inflorescence in the form of a disc of sessile flowers, the youngest at the centre. It occurs in the daisy and related plants
2.  anatomy, zoology a headlike part, esp the enlarged knoblike terminal part of a long bone, antenna, etc
[C18: from Latin, literally: a little head, from caput head]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1750, from L., lit. "little head," dim. of caput "head" (see head).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

capitulum ca·pit·u·lum (kə-pĭch'ə-ləm)
n. pl. ca·pit·u·la (-lə)
A small head or rounded articular extremity of a bone.

ca·pit'u·lar adj.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
capitulum   (kə-pĭch'ə-ləm)  Pronunciation Key 
Plural capitula
  1. A small knob or head-shaped part, such as a protuberance of a bone or the tip of an insect's antenna.

  2. An inflorescence consisting of a compact mass of small stalkless flowers, as in the English daisy. The yellow central portion of the capitulum of a daisy consists of disk flowers, while the outer white, petallike structures are actually ray flowers. The capitulum is the characteristic inflorescence of the composite family (Asteraceae) of flowering plants.

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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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