Peritoneum

Part of speech: noun

Pronunciation: /ˌpɛ.ɹɪ.təˈniː.əm/

Definitions

1. A membranous structure that encases the abdominal cavity and adheres to the organs within is responsible for their support and movement
2. This tissue covers the abdominal area, offering protection to the contained organs and facilitating their functions
3. A thin serous membrane lines the abdominal cavity and envelops the abdominal organs, aiding in movement and supporting organ function

Etymology: The membrane itself is older than its name. Ancient Greek physicians used "peritonaion" for the thin lining of the belly, and the word is built from "peri", meaning "around", and "teinein", meaning "to stretch", so its literal sense is something stretched or strained over the body's contents. The adjective "peritonaios" carried that same image of tension, and the noun was formed from it to name the stretched covering itself. The word reached English through Latin "peritonaeum", which Latin writers adopted from the Greek. Its use in English is a learned borrowing, so the word preserves the Greek anatomical picture of a membrane drawn tight over the viscera rather than any everyday English vocabulary. Its shape is typical of medical terms borrowed from classical sources, which kept their original Greek roots while gaining Latin endings.