‖Re‐tin″u‐la (?), n.; pl.Retinulæ (#). [NL., dim. of NL. & E. retina.] (Zoöl.) One of the group of pigmented cells which surround the retinophoræ of invertebrates. See Illust. under Ommatidium.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.