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The Collaborative International Dictionary of English v.0.48 (gcide)

Cilia \Cil"i*a\, n. pl. {Cilium}, the sing., is rarely used. [L.
cilium eyelid.]
1. (Anat.) The eyelashes.
[1913 Webster]

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.
[1913 Webster]

3. (Bot.) Hairlike processes, commonly marginal and forming a
fringe like the eyelash.
[1913 Webster]

4. (Zool.) Small, vibratory, swimming organs, somewhat
resembling true cilia, as those of Ctenophora.
[1913 Webster]