plural ischia
ˈi-skē-ə 
: the lower and posterior of the three principal bones composing either half of the pelvis
Examples of ischium in a Sentence
Recent Examples on the Web
The ornithischians were a vegan bunch — both their ischium and pubis pelvic bones pointed backwards, creating more room in the gut area to process all that vegetation.
—
Gemma Tarlach, Discover Magazine, 1 Nov. 2017
The animal — which, by the way, is known from several specimens — had a pelvic girdle with rear-pointing pubis and ischium, like the ornithischians.
—Gemma Tarlach, Discover Magazine, 16 Aug. 2017
The skeleton is nearly 80 percent complete, with its pelvic bones, pubis, hind limbs and the ischium all present from the evacuation.
—Dana Givens, Robb Report, 5 Dec. 2022
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, chicagotribune.com, 3 Feb. 2018
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Gemma Tarlach, Discover Magazine, 1 Nov. 2017
The animal — which, by the way, is known from several specimens — had a pelvic girdle with rear-pointing pubis and ischium, like the ornithischians.
—Gemma Tarlach, Discover Magazine, 16 Aug. 2017
The skeleton is nearly 80 percent complete, with its pelvic bones, pubis, hind limbs and the ischium all present from the evacuation.
—Dana Givens, Robb Report, 5 Dec. 2022
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, chicagotribune.com, 3 Feb. 2018
Cite this Entry
“Ischium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ischium. Accessed 27 Feb. 2025.
Copy CitationKids Definition
ischium
noun
is·chi·um
ˈis-kē-əm
plural ischia
-kē-ə
: the one of the three bones making up each side of the pelvis that is lowermost and in back
Medical Definition
ischium
noun
is·chi·um
ˈis-kē-əm
plural ischia
-ə
: 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
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