is·​chi·​um | \ ˈi-skē-əm How to pronounce ischium (audio) \
plural ischia\ ˈi-​skē-​ə How to pronounce ischium (audio) \

Definition of ischium

: the lower and posterior of the three principal bones composing either half of the pelvis

Other Words from ischium

ischial \ ˈi-​skē-​əl How to pronounce ischium (audio) \ adjective

Examples of ischium in a Sentence

Recent Examples on the Web Meanwhile, the epiphyses on the ischium and the ends of the femur and shin bone (tibia) were well-developed but hadn’t yet fused—in other words, DH7 wasn’t a very young child but was definitely still growing. Kiona N. Smith, Ars Technica, 10 Apr. 2020 The bones also included a right thighbone (femur) and hipbone (ischium), a right arm, and part of a lower right jaw and a few teeth. Kiona N. Smith, Ars Technica, 10 Apr. 2020 Ribs, back and lower hips If all goes to plan, this second week will also see Sue lose its chest ribs, neck and chest backbones, and pubis and ischium (the lower hip bones). Steve Johnson And Phil Geib,, 3 Feb. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ischium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of ischium

1646, in the meaning defined above

History and Etymology for ischium

Latin, hip joint, from Greek ischion

Learn More About ischium

Time Traveler for ischium

Time Traveler

The first known use of ischium was in 1646

See more words from the same year

Dictionary Entries Near ischium




See More Nearby Entries 

Statistics for ischium

Cite this Entry

“Ischium.” Dictionary, Merriam-Webster, Accessed 18 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for ischium


is·​chi·​um | \ ˈis-kē-əm How to pronounce ischium (audio) \
plural ischia\ -​ə How to pronounce ischium (audio) \

Medical Definition of ischium

: the dorsal and posterior of the three principal bones composing either half of the pelvis consisting in humans of a thick portion, a large rough eminence on which the body rests when sitting, and a forwardly directed ramus which joins that of the pubis

More from Merriam-Webster on ischium Encyclopedia article about ischium


Test Your Vocabulary

Name That Food

  • a-light
  • Name these cookies!
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!