stereocilium
noun
ste·reo·cil·i·um
| \ -ˈsil-ē-əm
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plural stereocilia\ -ē-ə
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Medical Definition of stereocilium
: a specialized microvillus that superficially resembles a cilium and projects from the surface of certain cells (as the auditory hair cells and the superficial epithelial cells of the epididymis) — see kinocilium