choroid, a. [gr. ; chorion + e'i^dos form.].
resembling the chorion; as, the choroid plexuses of the ventricles of the brain, and the choroid coat of the eyeball. [1913 Webster]
Choroid plexus (Anat.), one of the delicate fringelike processes, consisting almost entirely of blood vessels, which project into the ventricles of the brain.