From The Collaborative International Dictionary of English v.0.44 [gcide]:
Choroid \Cho"roid\, adjective [gr. ?; ? chorion + e'i^dos form.] (Anat.) resembling the chorion; as, the choroid plexuses of the ventricles of the brain, and the choroid coat of the eyeball. -- n. The choroid coat of the eye. See {Eye}.
{Choroid plexus} (Anat.), one of the delicate fringelike processes, consisting almost entirely of blood vessels, which project into the ventricles of the brain.
From WordNet (r) 2.0 [wn]:
noun
1: a highly vascular membrane in the eye between the retina and the sclera [syn: {choroid coat}]
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