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(), a.[L. tertiarius containing a third part, fr. tertius third: cf. F. tertiaire. See Tierce.] 1. Being of the third formation, order, or rank; third; as, a tertiary use of a word. Trench. 2. (Chem.) Possessing some quality in the third degree; having been subjected to the substitution of three atoms or radicals; as, a tertiary alcohol, amine, or salt. Cf. Primary, and Secondary. 3. (Geol.) Later than, or subsequent to, the Secondary. 4. (Zol.) Growing on the innermost joint of a bird's wing; tertial; -- said of quills. Tertiary age. (Geol.) See under Age, 8. Tertiary color, a color produced by the mixture of two secondaries. "The so-called tertiary colors are citrine, russet, and olive." Fairholt. Tertiary period. (Geol.) (a) The first period of the age of mammals, or of the Cenozoic era. (b) The rock formation of that period; -- called also Tertiary formation. See the Chart of Geology. Tertiary syphilis (Med.), the third and last stage of syphilis, in wh Ter"tiary 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. (Zol.) One of the quill feathers which are borne upon the basal joint of the wing of a bird. See Illust. of Bird. スポンサード リンク
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