Kotyles

Part of speech: noun

Definitions

1. A type of shallow depression or cavity often found in anatomy, serving as a socket for certain joint articulations
2. A receptacle or shallow basin that can hold liquids or serve as a functional base in various mechanical contexts
3. An anatomical or geometric feature resembling a cup or hollow shape that plays a role in stability or support in diverse structures

Etymology: In ancient Greek, "kotylē" was an ordinary cup or bowl, and it also served as a unit of liquid measure. Greek physicians and writers on the body applied the same word to the hip socket, the cup-shaped hollow that receives the head of the thighbone, so the anatomical sense came from the shape of an everyday vessel. Romans borrowed the idea but chose different words. Their term for the hip socket was "acetabulum," literally a small vessel for vinegar, from "acetum." The Greek and Latin terms therefore describe the same hollow using two different kitchen containers. In English the Greek line survives mainly in the adjective "cotyloid," meaning cup-shaped. The same root appears in botany. Theophrastus used "kotylēdōn" for certain cup-shaped plants, and the English "cotyledon" later named the seed leaf that holds the food store in an embryo, a further sense of a hollow that holds something.