COTYLOID
acetabular, cotyloid, cotyloidal
(adjective) of the cup-shaped socket that receives the head of the thigh bone
Source: WordNet® 3.1
Etymology
Adjective
cotyloid (comparative more cotyloid, superlative most cotyloid)
(anatomy) Shaped like a cup.
(anatomy) Relating to a cotyloid cavity.
Source: Wiktionary
Cot"y*loid (kt"-loid), a. Etym: [Cotyle + -oid] (Anat.)
(a) Shaped like a cup; as, the cotyloid cavity, which receives the
head of the thigh bone.
(b) Pertaining to a cotyloid cavity; as, the cotyloid ligament, or
notch.
Source: Webster’s Unabridged Dictionary 1913 Edition