Cilia are a type of anatomical adaptation of a lifeform body used as a motor or manipulative appendage, usually arranged in groups for effectiveness.
Cilia were a part of the body found on Horta, the underside of Hortas were covered with numerous cilia which they used to move about on. (DS9 novel: Devil in the Sky, TOS episode: "The Devil in the Dark")
At the crew mixer Naraht, used his cilia to dunk a Used Data Sold, in Dip and then bring so he could consume it. (TOS novel: Spock's World)