Source : Webster's Revised Unabridged Dictionary (1913)

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

   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.

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

   4. (Zo["o]l.) Small, vibratory, swimming organs, somewhat
      resembling true cilia, as those of Ctenophora.

Source : WordNet®

cilia
     See {cilium}

cilium
     n 1: a hairlike projection from the surface of a cell; provides
          locomotion in free-swimming unicellular organisms
     2: any of the short curved hairs that grow from the edges of
        the eyelids [syn: {eyelash}, {lash}]
     [also: {cilia} (pl)]