資料來源 : Webster's Revised Unabridged Dictionary (1913)

Tertiary \Ter"ti*a*ry\, n.; pl. {Tertiaries}.
   1. (R. C. Ch.) A member of the Third Order in any monastic
      system; as, the Franciscan tertiaries; the Dominican
      tertiaries; the Carmelite tertiaries. See {Third Order},
      under {Third}. --Addis & Arnold.

   2. (Geol.) The Tertiary era, period, or formation.

   3. (Zo["o]l.) One of the quill feathers which are borne upon
      the basal joint of the wing of a bird. See Illust. of
      {Bird}.