Anatomy. the socket in the hipbone that receives the head of the thighbone.
Zoology. any of the suction appendages of a leech, octopus, etc.
- ac·e·tab·u·lar, adjective
- post·ac·e·tab·u·lar, adjective
- pre·ac·e·tab·u·lar, adjective
- sub·ac·e·tab·u·lar, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use acetabulum in a sentence
In Birds the acetabulum is perforated, as in many of the fossils named Dinosaurs, and in Monotremata.Dragons of the Air | H. G. Seeley
Secondly, the ilium is elongated, and extends quite as much in front of the acetabulum as behind it.Dragons of the Air | H. G. Seeley
The ilium is a somewhat cylindrical bone which at its ventral end meets the ischium, and forms part of the acetabulum.
Each half bears at its posterior end a deep cup, the acetabulum, with which the head of the femur articulates.
All three bones contribute largely to the formation of the acetabulum, with which the head of the femur articulates.
British Dictionary definitions for acetabulum
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
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