What does cotyle mean?
Cotyle is a chiefly technical English noun denoting a cup-shaped cavity, most familiarly the acetabulum — the rounded socket in the pelvic bone into which the head of the femur fits, forming the hip joint. The word descends directly from the ancient Greek kotylē, meaning a drinking cup, and its shape-based imagery extends into related terms such as cotyloid (cup-shaped) and cotyledon (literally a 'cuplike' seed leaf). In modern usage, cotyle appears almost exclusively in anatomy, orthopaedics, and older medical literature; clinicians overwhelmingly prefer the Latin-derived acetabulum when referring to the hip socket. For general readers, cotyle is best understood as an elegant, etymologically vivid synonym for a bodily cup or hollow — a reminder that many anatomical names began as everyday objects, with the body described through the vocabulary of household things like cups, vessels, and sockets.
nounA cup-shaped cavity or structure, especially the acetabulum of the hip bone that receives the head of the femur; more generally, any anatomical or botanical cup-like formation.
- Anatomy: the cup-shaped socket of the hip bone (the acetabulum) that receives the head of the femur.
- Botany and general anatomy: a cup-shaped hollow or cavity, especially one resembling a cup.
"The surgeon examined the cotyle to assess how deeply the femoral head sat within the socket."
"In a healthy joint, the femoral head rotates smoothly within the cotyle of the pelvis."
"The term cotyloid describes anything shaped like a cup, echoing the form of the cotyle."
The plural follows regular English inflection and appears mainly in anatomical descriptions referring to paired or multiple cup-shaped structures.
"Both cotyles were inspected during the reconstruction of the pelvis."
The word for your hip socket comes straight from the ancient Greek word for a drinking cup.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cotyle
Cotyle derives from the ancient Greek kotylē (κότύλη), meaning a cup or drinking vessel, which was also used as a unit of liquid measure. The term entered scientific Latin and thence English anatomical vocabulary, where it named cup-shaped cavities, most notably the hip socket. It shares this Greek root with cotyledon, literally 'a cuplike thing', the botanical term for a seed leaf, and gives rise to the adjective cotyloid, meaning cup-shaped.
Related word forms
How cotyle is actually used
"Cotyle" is rare outside specialist contexts such as anatomy, orthopaedics, and historical medical texts; "acetabulum" is the far more common term for the hip socket in modern clinical use. The adjective "cotyloid" is encountered slightly more often than the noun itself.
Easily confused with cotyle
A cotyledon is the seed leaf of a plant embryo, whereas a cotyle is a cup-shaped anatomical cavity such as the hip socket.