1. [syn: Tertiary, Tertiary period]
The Collaborative International Dictionary of English v.0.48:
Tertiary \Ter"ti*a*ry\, 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. (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. "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
(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
WordNet (r) 3.0 (2006):
n 1: from 63 million to 2 million years ago [syn: Tertiary,