a. 第三的, 第三位的, 第三产业的

n. 第三修道会会员, 第三纪

[化] 叔(指CH-3...C(CH-3)-2-型支链烃基或指三元胺及R-3COH型的醇)
第三的; 三代的(指无机盐)

[医] 第三期的, 第三的

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. (Zo["o]l.) 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 which it invades the bones and internal
organs.


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}.