noun, plural acetabula [as-i-tab-yuh-luh] .
Anatomy. the socket in the hipbone that receives the head of the thighbone. See illus. under pelvis.
Zoology. any of the suction appendages of a leech, octopus, etc.

1660–70; < Latin: hip socket, cup-shaped part of a plant (Pliny), literally, small cup, orig. for vinegar, equivalent to acēt(um) vinegar + -ā- by analogy with verbal derivatives (cf. vocable) + -bulum suffix denoting instrument or vessel

acetabular, adjective
postacetabular, adjective
preacetabular, adjective
subacetabular, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acetabulum (ˌæsɪˈtæbjʊləm)
n , pl -la
1.  the deep cuplike cavity on the side of the hipbone that receives the head of the thighbone
2.  a round muscular sucker in flatworms, leeches, and cephalopod molluscs
3.  the aperture in the thorax of an insect that holds the leg
[Latin: vinegar cup, hence a cuplike cavity, from acētum vinegar + -abulum, suffix denoting a container]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

acetabulum ac·e·tab·u·lum (ās'ĭ-tāb'yə-ləm)
n. pl. ac·e·tab·u·la (-lə)
The cup-shaped cavity at the base of the hipbone into which the ball-shaped head of the femur fits. Also called cotyloid cavity.

ac'e·tab'u·lar adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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