Cilia (?), n. pl. Cilium, the sing., is rarely used. [L. cilium eyelid.] 1. (Anat.) The eyelashes.
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2. (Biol.) Small, generally microscopic, vibrating appendages lining certain organs, as the air passages of the higher animals, and in the lower animals often covering also the whole or a part of the exterior. They are also found on some vegetable organisms. In the Infusoria, and many larval forms, they are locomotive organs.
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3. (Bot.) Hairlike processes, commonly marginal and forming a fringe like the eyelash.
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4. (Zoöl.) Small, vibratory, swimming organs, somewhat resembling true cilia, as those of Ctenophora.
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