☉octante, adj., eighty, fourscore.
☉octantième (-tièm), adj., eightieth.
octarchie (-shi), n.f., octarchy.
octave, n.f., octave; eight.
octavin, n.m., octave-flute.
octavo, adv., eighthly. V. in-octavo.
octavon, n.m., -ne, n.f., octoroon, mustee, person one-eighth black.
octidi, n.m., octidi, eighth day of the decade in the calendar of the first French republic.
octil, adj.m., (astron.) octile.
octobre, n.m., October.