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e of neutralizing four molecules of a monacid base; having four hydrogen atoms capable of replacement by bases; quadribasic; -- said of certain acids; thus, normal silicic acid, Si(OH)4, is a tetrabasic acid.

of neutralizing four molecules of a monobasic acid; having four hydrogen atoms capable of replacement ba acids or acid atoms; -- said of certain bases; thus, erythrine, C4H6(OH)4, is a tetracid alcohol.

A hypothetical compound, C2H2N4 which may be regarded as benzene with four CH groups replaced by nitrogen atoms; also, any of various derivatives of the same. There are three isomeric varieties.

rystalline acid substance, CH2N4, which may be regarded as pyrrol in which nitrogen atoms replace three CH groups; also, any of various derivatives of the same.

The fireplace at the side of an annealing oven. Knight.

f the tontine period received the entire surplus. This plan of tontine insurance has been replaced in the United States by the semitontine plan, in which the surplus is divided among the holders of policies in force at the termination of the tontine period, but the reverse for the paid-up value is paid on lapsed polici…

ily organ or of tissues from one person, and the insertion of them into another person to replace a damaged organ or tissue; as, the transplantation of a heart, kidney, or liver.

molecules of a monacid base, or their equivalent; having three hydrogen atoms capable of replacement by basic elements on radicals; -- said of certain acids; thus, citric acid is a tribasic acid.

A glyceride formed by the replacement of three hydrogen atoms in glycerin by acid radicals.

Replaced, or cut off, by a plane, especially when equally inclined to the adjoining faces; as, a truncated edge.

The replacement of an edge or solid angle by a plane, especially when the plane is equally inclined to the adjoining faces.

Acting as a substitute; -- said of abnormal action which replaces a suppressed normal function; as, vicarious hemorrhage replacing menstruation.

the Anglo-Saxon, or Old English, alphabet. It had the value of modern English w, and was replaced from about a. d. 1280 at first by uu, later by w.

Abnormal coloration of feathers in which yellow replaces the normal color, as in certain parrots. It is commonly due to lack of the dark pigment which with yellow forms green.