- cilium - a hairlike projection from the surface of a cell; provides locomotion in free-swimming unicellular organisms
--1 is a kind of organelle, cell organ
- eyelash, lash, cilium - any of the short curved hairs that grow from the edges of the eyelids
--2 is a kind of hair
--2 is a part of eyelid, lid, palpebra - eyelash, lash, cilium - any of the short curved hairs that grow from the edges of the eyelids