CILIUM Defined for Kids
Definition of cilium for Students
: a tiny hairlike structure on the surface of some cells
Medical Definition of cilium
2: a minute, short, hairlike process that projects from the surface of most eukaryotic cells, is composed chiefly of microtubules, in unicellular organisms functions chiefly in locomotion, and in higher forms serves especially in the movement of fluids and particles (as the passage of mucus and dust from the lungs) and in sensory reception—see ciliopathy
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