concha
UK[ˈkɒŋkə]US[ˈkɑːŋkə]
n
a structure in the body that resembles a shell in shape, especially any of the three curved sections of the bony outer wall of the nasal cavity.
n
the largest and deepest concavity of the external ear, leading to the ear canal.
n
(architecture) the domed roof of a semicircular apse.
Etymology
the word 'concha' is a direct borrowing from latin, where it signified a mollusk shell or a vessel made from one. this latin term is believed to have originated from a greek source, konkhē, which carried a similar meaning of "shell" or "cockle". the greek word itself may trace back to the proto-indo-european root konkho-, also meaning "shell". the semantic logic is straightforward: the modern english term retains the core concept of a curved, hollow, shell-like form but applies it specifically to anatomical features of the ear and nose, as well as certain architectural domes, drawing a direct metaphorical link between the shape of a seashell and these structures.
Analysis
the entire word 'concha' functions as a simplex loanword from latin, where it meant "shell, mussel, shellfish". it is a noun used directly in english to denote shell-like anatomical or architectural structures.
Examples
the superior nasal concha is one of the thin, scroll-like bony plates on the lateral wall of the nasal cavity.
an infection can sometimes develop in the concha of the outer ear.
the apse was crowned with a beautiful half-dome, known as a concha.