Tertiary

a.	1.	Being of the third formation, order, or rank; third; as, a tertiary use of a word.
	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.	(Zool.) 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. Tertiary period a - (Geol.) The first period of the age of mammals, or of the Cenozoic era. - Fairholt. 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 which it invades the bones and internal organs.
n.	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.
	2.	(Geol.) The Tertiary era, period, or formation.
	3.	(Zool.) One of the quill feathers which are borne upon the basal joint of the wing of a bird. See Illust. of Bird.

Noun	1.	Tertiary - from 63 million to 2 million years ago Synonyms: Tertiary period
Adj.	1.	tertiary - coming next after the second and just before the fourth in position Synonyms: 3rd, third

Maxwell triangle, Munsell scale, chromatic circle, chromatic spectrum, chromaticity diagram, color circle, color cycle, color index, color mixture curve, color solid, color spectrum, color system, color triangle, complementary color, covert, demitint, feather, feathers, full color, fundamental colors, hackle, half tint, halftone, hue cycle, mail, metamer, monochrome, plumage, primary, primary color, pure color, secondary, secondary color, solar spectrum, spectral color, spectrum, spectrum color, speculum, tertiary color, third

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