Definition of cilia

• n. pl. - The eyelashes.
• n. pl. - 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.
• n. pl. - Hairlike processes, commonly marginal and forming a fringe like the eyelash.
• n. pl. - Small, vibratory, swimming organs, somewhat resembling true cilia, as those of Ctenophora.