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choroid (adj.)

"like a chorion, membranous," 1680s, from Latinized form of Greek khoroeides, a corruption of khorioeides, from khorion (see chorion) + eidos "resemblance" (see -oid). Related: Choroidal.

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Definitions of choroid from WordNet

choroid (n.)
a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eye;
Synonyms: choroid coat
From wordnet.princeton.edu