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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A slight natural covering; an integument. The tunicles that make the ball or apple of the eye. (Holland)

2. A short, close-fitting vestment worn by bishops under the dalmatic, and by subdeacons.

Origin: L. Tunicula a little tunic, coat, or membrane, dim. Of tunica a tunic: cf. OF. Tunicle.