Secondary circle

Secondary Sec"ond*a*ry, a. [Cf. F. secondaire, L. secundaire. See {Second}, a.] 1. Succeeding next in order to the first; of second place, origin, rank, etc.; not primary; subordinate; not of the first order or rate. [1913 Webster]

Wheresoever there is moral right on the one hand, no secondary right can discharge it. --L'Estrange. [1913 Webster]

Two are the radical differences; the secondary differences are as four. --Bacon. [1913 Webster]

2. Acting by deputation or delegated authority; as, the work of secondary hands. [1913 Webster]

3. (Chem.) Possessing some quality, or having been subject to some operation (as substitution), in the second degree; as, a secondary salt, a secondary amine, etc. Cf. {primary}. [1913 Webster]

Note: A primary amine has the general formula {R.NH2}; a secondary amine has the general formula {R.NH.R'}, where R and R' are alkyl or aryl groups. A primary alcohol has the general formula {R.CH2.OH}; a secondary alcohol has the general formula {R.CHOH.R'}. Tertiary amines and alcohols have the general formulas {R.CR'N.R'} and {R.CR'OH.R'}, respectively. [PJC]

4. (Min.) Subsequent in origin; -- said of minerals produced by alteration or deposition subsequent to the formation of the original rock mass; also of characters of minerals (as secondary cleavage, etc.) developed by pressure or other causes. [1913 Webster]

5. (Zo["o]l.) Pertaining to the second joint of the wing of a bird. [1913 Webster]

6. (Med.) (a) Dependent or consequent upon another disease; as, Bright's disease is often secondary to scarlet fever. (b) Occurring in the second stage of a disease; as, the secondary symptoms of syphilis. [1913 Webster]

{Secondary accent}. See the Note under {Accent}, n., 1.

{Secondary age}. (Geol.) The Mesozoic age, or age before the Tertiary. See {Mesozoic}, and Note under {Age}, n., 8.

{Secondary alcohol} (Chem.), any one of a series of alcohols which contain the radical {CH.OH} united with two hydrocarbon radicals. On oxidation the secondary alcohols form ketones.

{Secondary amputation} (Surg.), an amputation for injury, performed after the constitutional effects of the injury have subsided.

{Secondary axis} (Opt.), any line which passes through the optical center of a lens but not through the centers of curvature, or, in the case of a mirror, which passes through the center of curvature but not through the center of the mirror.

{Secondary battery}. (Elec.) See under {Battery}, n., 4.

{Secondary circle} (Geom. & Astron.), a great circle that passes through the poles of another great circle and is therefore perpendicular to its plane.

{Secondary circuit}, {Secondary coil} (Elec.), a circuit or coil in which a current is produced by the induction of a current in a neighboring circuit or coil called the primary circuit or coil.

{Secondary color}, a color formed by mixing any two primary colors in equal proportions.

{Secondary coverts} (Zo["o]l.), the longer coverts which overlie the basal part of the secondary quills of a bird. See Illust. under {Bird}.

{Secondary crystal} (Min.), a crystal derived from one of the primary forms.

{Secondary current} (Elec.), a momentary current induced in a closed circuit by a current of electricity passing through the same or a contiguous circuit at the beginning and also at the end of the passage of the primary current.

{Secondary evidence}, that which is admitted upon failure to obtain the primary or best evidence.

{Secondary fever} (Med.), a fever coming on in a disease after the subsidence of the fever with which the disease began, as the fever which attends the outbreak of the eruption in smallpox.

{Secondary hemorrhage} (Med.), hemorrhage occuring from a wounded blood vessel at some considerable time after the original bleeding has ceased.

{Secondary planet}. (Astron.) See the Note under {Planet}.

{Secondary qualities}, those qualities of bodies which are not inseparable from them as such, but are dependent for their development and intensity on the organism of the percipient, such as color, taste, odor, etc.

{Secondary quills} or {Secondary remiges} (Zo["o]l.), the quill feathers arising from the forearm of a bird and forming a row continuous with the primaries; -- called also {secondaries}. See Illust. of {Bird}.

{Secondary rocks} or {Secondary strata} (Geol.), those lying between the Primary, or Paleozoic, and Tertiary (see {Primary rocks}, under {Primary}); -- later restricted to strata of the Mesozoic age, and at present but little used.

{Secondary syphilis} (Med.), the second stage of syphilis, including the period from the first development of constitutional symptoms to the time when the bones and the internal organs become involved.

{Secondary tint}, any subdued tint, as gray.

{Secondary union} (Surg.), the union of wounds after suppuration; union by the second intention. [1913 Webster]

Syn: Second; second-rate; subordinate; inferior. [1913 Webster]