Webster's English Dictionary

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cilium

cil.i.um \'sil-e--*m\ \-e--*\ n or cil.ia [NL, fr. L, eyelid] pl  1: 
   EYELASH  2: a minute hairlike process often forming a fringe; esp : a 
   hairli ke process of many cells that is capable of lashing movement and 
   serves esp. in free unicellular organisms to produce locomotion or in 
   higher forms a current of fluid