1560s, Latin, literally "eyebrow, ridge, summit; haughtiness" (see supercilious).
supercilium su·per·cil·i·um (sōō'pər-sĭl'ē-əm)n. pl. su·per·cil·i·a (-ē-ə)
The eyebrow.
An individual hair of the eyebrow.