WordReference Random House Unabridged Dictionary of American English © 2020
su•per•cil•i•um  (so̅o̅′pər silē əm),USA pronunciation n., pl.  -cil•i•a (so̅o̅′pər silē əm),USA pronunciation [Archit.]
  1. the fillet above the cyma of a cornice.
  2. (on an Attic base) either of the fillets above and below the scotia.
  • Latin: eyebrow, haughtiness, equivalent. to super- super- + -cilium eyelid, akin to cēlāre to conceal, English hull, Greek kaliá hut, shrine; compare -ium
  • 1555–65

'supercilium' also found in these entries (note: many are not synonyms or translations):

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