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The formal or distinguishing part of the essence of a species; the characteristic attribute of a species; specific difference.

lating to or indicating a difference; creating a difference; discriminating; special; as, differential characteristics; differential duties; a differential rate. For whom he produced differential favors. Motley.

In the way of differentiation.

y a specific difference; to effect a difference in, as regards classification; to develop differential characteristics in; to specialize; to desynonymize. The word then was differentiated into the two forms then and than. Earle. Two or more of the forms assumed by the same original word become differentiated in signifi…

The act of differentiating. Further investigation of the Sanskrit may lead to differentiation of the meaning of such of these roots as are real roots. J. Peile.

One who, or that which, differentiates.

Not differentiated; specifically (Biol.), homogenous, or nearly so; -- said especially of young or embryonic tissues which have not yet undergone differentiation (see Differentiation, 3), that is, which show no visible separation into their different structural parts.

An instrument consisting in part of a differential thermometer. It is used for measuring changes of temperature produced by different conditions of the sky, as when clear or clouded.

The primitive enteron or undifferentiated digestive sac of a gastrula or other embryo. See Illust. under Invagination.

endence which bind the variable quantities together are themselves subject to change. -- Differential calculus, a method of investigating mathematical questions by using the ratio of certain indefinitely small quantities called differentials. The problems are primarily of this form: to find how the change in some vari…

the whole series of cells having been formed from the development of the germ cell and by differentiation converted into tissues and organs which, both in plants ans animals, are to be considered as a mass of minute cells communicating with each other. -- Cellular tissue. (a) (Anat.) See conjunctive tissue under Conju…

screw (Mech.), a screw having on the same axis two or more screws with different pitch (a differential screw), or running in different directions (a right and left screw). -- Compound time (Mus.), that in which two or more simple measures are combined in one; as, 6-8 time is the joining of two measures of 3-8 time. -…

, as the number 10, or any numeral. -- Arbitrary constant, an undetermined constant in a differential equation having the same value during all changes in the values of the variables.

næ or layers; one of the methods by which the various blastodermic layers of the ovum are differentiated.

An undifferentiated aggregate of cells or plastids.

unction from another according to some fixed law, called the law of derivation, as the of differentiation or of integration.

The addition of a differentia to a concept or notion, thus limiting its extent; -- the opposite of generalization.

To define or limit by adding a differentia.

he love of epigram. Compton Reade. My diagnosis of his character proved correct. J. Payn. Differential diagnosis (Med.), the determination of the distinguishing characteristics as between two similar diseases or conditions.

The quality or attribute which is added to those of the genus to constitute a species; a differentia.