Acetabulum

Part of speech: noun

Pronunciation: /ˌæs.ɪˈtæb.jʊl.əm/

Definitions

1. A concave cavity located in the pelvis that interfaces with the femur's head to enable hip joint movement and support
2. A socket in the pelvic bone that articulates with the femoral head, facilitating mobility of the hip joint and providing structural support
3. An anatomical depression found in the pelvis where the head of the femur fits, allowing for hip joint movement and stability

Etymology: The hip socket is named after a vinegar dish. In ancient Rome, "acetabulum" referred to a small saucer for vinegar, and it was also a unit of measure equal to a forty-eighth of a congius, a liquid measure. The Latin name is built from "acetum," meaning vinegar, plus the suffix "-bulum," which marks a vessel for holding something, so the word literally describes a container for vinegar. The link to the body came from shape. The round, cup-like cavity in the pelvis that receives the head of the femur resembles that little bowl, and Latin speakers applied the old word to the anatomical socket. English took it directly from Latin as a learned borrowing, so it kept its scholarly, medical flavour and never passed through everyday speech.