What does cotyloid mean?
"Cotyloid" is a technical adjective used chiefly in anatomy to describe anything shaped like a hollow cup, and most specifically the cup-like socket of the pelvis that houses the head of the thigh bone. The anatomical landmark known as the cotyloid cavity is more commonly called the acetabulum, while related structures such as the cotyloid notch and cotyloid ligament appear routinely in surgical and orthopaedic literature. The word derives from the ancient Greek "kotylē," meaning a cup or drinking vessel, via the adjectival ending "-oid" ("in the form of"), so its very shape-language evokes everyday tableware applied to the human skeleton. Outside medicine, "cotyloid" occasionally serves as a general descriptor for concave, goblet-like forms in descriptive anatomy of other animals. Because it belongs to specialist vocabulary, readers will encounter it mainly in textbooks and clinical writing rather than casual conversation.
adjectiveShaped like a cup or hollow; in anatomy, specifically describing the cup-like socket of the hip bone (the acetabulum) that receives the head of the femur.
- Anatomy: relating to or shaped like a cup, especially denoting the acetabulum (hip socket) and its associated structures.
- Generally: having the form of a hollow cup.
"The surgeon examined the cotyloid cavity to assess the extent of the patient's hip dysplasia."
"The cotyloid notch allows blood vessels to pass into the ligament of the head of the femur."
"In comparative anatomy, the cotyloid form of the joint surface distinguishes mammals' ball-and-socket hips."
The word for the hip's cup-shaped socket comes straight from an ancient Greek drinking cup — your pelvis is named after tableware.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cotyloid
The word traces to the ancient Greek "kotylidēs," meaning "like a cup," formed from "kotylē," a drinking cup or hollow vessel, combined with the suffix "-oid." It entered scientific Latin as "cotyloideus" before passing into English anatomical terminology, where it has been established since at least the early modern period of medical Latin usage. Its most notable cognate in English is "cotyledon," the seed leaf of a plant embryo, which shares the same Greek root for a cup-shaped object.
How cotyloid is actually used
A technical term used almost exclusively in anatomy, orthopaedics, and zoology; rare in general prose.