uterus

noun

uter·​us ˈyü-tə-rəs 

ˈyü-trəs

plural uteri ˈyü-tə-ˌrī  or uteruses

1

: a muscular organ of the female mammal for containing and usually for nourishing the young during development prior to birth

called also womb

2

: a structure in some other animals (such as salamanders and nematodes) analogous to the mammalian uterus in which eggs or young develop

Examples of uterus in a Sentence

Recent Examples on the Web

Endometrial cancer is the most common gynecologic cancer, originating in the lining of the uterus, called the endometrium, according to StatPearls, an online library published in the National Library of Medicine. —Dr. Chidimma J. Acholonu, ABC News, 3 Apr. 2026

Another possibility is that their bodies simply don’t respond as well to IVF stimulation drugs—medications that push the ovaries to produce multiple mature eggs at once that are later inseminated to make embryos that can be transferred to the uterus in the hopes of establishing a pregnancy. —Sarah Elizabeth Richards, Scientific American, 2 Apr. 2026

This month, the zoo announced Tina was suffering from an infection and abnormal buildup of fluid in her uterus. —Lila Seidman, Los Angeles Times, 31 Mar. 2026

These engineering innovations, implemented in a mobile support platform, represent the first working prototype of an artificial uterus for mammalian gestation. —Srishti Gupta, Interesting Engineering, 28 Mar. 2026

Word History

Etymology

Middle English, from Latin, belly, womb; probably akin to Greek hoderos belly, Sanskrit udara

First Known Use

14th century, in the meaning defined at sense 1

Kids Definition

uterus

noun

uter·​us ˈyüt-ə-rəs 

plural uteruses or uteri -ˌrī 

: the muscular organ of a female mammal in which the young develop before birth

called also womb

Medical Definition

uterus

noun

uter·​us ˈyüt-ə-rəs 

plural uteri -ˌrī  also uteruses

: an organ in female mammals for containing and usually for nourishing the young during development prior to birth that consists of a greatly modified and enlarged section of an oviduct (as in rodents and marsupials) or of the two oviducts united (as in the higher primates including humans), that has thick walls consisting of an outer serous layer, a very thick middle layer of smooth muscle, and an inner mucous layer containing numerous glands, and that during pregnancy undergoes great increase in size and change in the condition of its walls

called also womb

see cervix sense 2a, corpus uteri, endometrium, fundus sense c, myometrium, perimetrium