stereocilium

noun

ste·​reo·​cil·​i·​um -ˈsil-ē-əm 

plural stereocilia -ē-ə 

: 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