- Anatomy. the socket in the hipbone that receives the head of the thighbone.
- Zoology. any of the suction appendages of a leech, octopus, etc.
Origin of acetabulum
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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for acetabulum
The acetabulum is perforated in Echidna as in birds, but not in Ornithorhynchus.The Vertebrate Skeleton
Sidney H. Reynolds
In the pelvis the acetabulum is perforate (in Echidna), as in Sauropsida.The Cambridge Natural History, Vol X., Mammalia
Frank Evers Beddard
The large, round head of this bone is placed in the acetabulum.
The obturator foramen is a small oval opening posteroventral to the acetabulum between the ischium and the pubis.
The ilio-ischiatic fenestra is a large oblong opening behind the acetabulum between the ilium and the ischium.
- the deep cuplike cavity on the side of the hipbone that receives the head of the thighbone
- a round muscular sucker in flatworms, leeches, and cephalopod molluscs
- 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- The cup-shaped cavity at the base of the hipbone into which the ball-shaped head of the femur fits.cotyloid cavity
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.