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1680s, from Latinized form of Greek khoroeides, a corruption of khorioeides, from khorion (see chorion) + eidos "resemblance" (see -oid).
choroid cho·roid (kôr'oid') or cho·ri·oid (kôr'ē-oid')n. The dark-brown vascular coat of the eye between the sclera and the retina. adj. Relating to the chorion or corium.
Resembling the chorion; membranous.
Relating to or involving the choroid of the eye.