"the eyelashes, hairs which grow from the margins of the eyelid," 1715, from Latin cilia, plural of cilium "eyelid, eyelash," perhaps related to celare "to cover, hide," from PIE root *kel- (1) "to cover, conceal, save," but words for this part of the face can be tricky (see brow). Later extended to one of the minute hair-like processes projecting from a cell or organism (1835). It sometimes is pluralized in English, which is an error. Related: Ciliary; ciliate.
<a href="https://www.etymonline.com/word/ciliated">Etymology of ciliated by etymonline</a>
Harper, D. (n.d.). Etymology of ciliated. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/ciliated