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

The condition increases the risk of serious complications including placental abruption, in which the placenta separates from the uterus before delivery. — Faye Chiu, CNN Money, 21 Aug. 2026

Endometriosis Treatment Endometriosis is a common, chronic condition in which tissue from the lining of the uterus (endometrium) grows outside the uterus. — Carrie Madormo, Verywell Health, 18 Aug. 2026

Nidhi imagined the baby crawling around in her mother’s body, desperately seeking the uterus, and, failing to find it in its proper place, quietly shrivelling up and dying. — Madhuri Vijay, New Yorker, 16 Aug. 2026

Women with a uterus will also generally need a progestogen alongside systemic estrogen to protect the uterine lining. — Emily Cegielski, Flow Space, 13 Aug. 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