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n. pl. Cilium, the sing., is rarely used.


 - (Anat.) The eyelashes.


 - (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.


 - (Bot.) Hair like processes, commonly marginal and forming a fringe like the eyelash.


 - (Zool.) Small, vibratory, swimming organs, somewhat resembling true cilia, as those of Ctenophora.

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