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A point where one branch of a curve crosses another branch. See Double point, under Double, a.

A roof having a double slope, or composed, on each side, of two parts which have unequal inclination; a gambrel roof.

ailed of this fair proportion. Shak. Our incomes have been curtailed; his salary has been doubled. Macualay.

it passes through all the other points of the curve. Any other curve is called a curve of double curvature, or a twisted curve.

-- Dagger of lath, the wooden weapon given to the Vice in the old Moralities. Shak. -- Double dagger, a mark of reference [||] which comes next in order after the dagger. -- To look, or speak, daggers, to look or speak fiercely or reproachfully.

ethod of business; traffic; intercourse; transaction; as, to have dealings with a person. Double dealing, insincere, treacherous dealing; duplicity. -- Plain dealing, fair, sincere, honorable dealing; honest, outspoken expression of opinion.

contemporaries. Buckle. Deficiency of a curve (Geom.), the amount by which the number of double points on a curve is short of the maximum for curves of the same degree.

; hesitation as to proceeding; suspense of decision or action; scruple. All my demurs but double his attacks; At last he whispers, "Do; and we go snacks." Pope.

Originally, a double song; a melody or counterpoint sung above the plain song of the tenor; a variation of an air; a variation by ornament of the main subject or plain song.

A double-walled glass vessel for holding liquid air, etc., having the space between the walls exhausted so as to prevent conduction of heat, and sometimes having the glass silvered to prevent absorption of radiant heat; -- called also, according to the particular shape, Dewar bulb, Dewar tube, etc.

A prefix, signifying twofold, double, twice; (Chem.)

That which burns by refraction, as a double convex lens, or the sun's rays concentrated by such a lens, sometimes used as a cautery.

e scale of the instrument. They are of several kinds, as open diapason, stopped diapason, double diapason, and the like.

A double star; -- applied to the nucleus of a cell, when, during cell division, the loops of the nuclear network separate into two groups, preparatory to the formation of two daughter nuclei. See Karyokinesis.

Having two heads on one body; double-headed.

Having the uterus double; of or pertaining to the Didelphia.

The mark ||; -- called also double dagger.

A double iambus; a foot consisting of two iambuses (

Ambiguous; of double meaning. [Obs.] T. Adams.

olorless, crystalline hydrocarbon, C20H14, obtained from naphthylene, and consisting of a doubled naphthylene radical.