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tar made of hydraulic lime, which will harden under water. -- Hydraulic elevator, a lift operated by the weight or pressure of water. -- Hydraulic jack. See under Jack. -- Hydraulic lime, quicklime obtained from hydraulic limestone, and used for cementing under water, etc. -- Hydraulic limestone, a limestone which…

The art or operation of measuring the velocity or discharge of running water, as in rivers, etc.

The act or operation of smearing the body with mud, especially with the sediment from mineral springs; a mud bath.

nary expression or quantity (Alg.), an algebraic expression which involves the impossible operation of taking the square root of a negative quantity; as, sq. root-9, a + b sq. root-1. -- Imaginary points, lines, surfaces, etc. (Geom.), points, lines, surfaces, etc., imagined to exist, although by reason of certain cha…

nible by the mind; not easily apprehended. Almost imperceptible to the touch. Dryden. Its operation is slow, and in some cases almost imperceptible. Burke. -- Im`per*cep"ti*ble*ness, n. -- Im`per*cep"ti*bly, adv. Their . . . subility and imperceptibleness. Sir M. Hale.

The projector, manager, or conductor, of an opera or concert company.

ow'd his enemy king, and did him service, Improper for a slave. Shak. And to their proper operation still, Ascribe all Good; to their improper, Ill. Pope.

Operation. [Obs.]

That which moves or influences the mind, or operates on the passions; that which incites, or has a tendency to incite, to determination or action; that which prompts to good or ill; motive; spur; as, the love of money, and the desire of promotion, are two powerful incentives to action. The greatest obstacles, the great…

Recently, or just, begun; beginning; partially but not fully in existence or operation; existing in its elements; incomplete. -- In"cho*ate*ly, adv. Neither a substance perfect, nor a substance inchoate. Raleigh.

Not cognizant; failing to apprehended or notice. Of the several operations themselves, as acts of volition, we are wholly incognizant. Sir W. Hamilton.

ly to the whole which they constitute, or into which they may be united collectively; the operation of discovering and proving general propositions; the scientific method. -- Philosophical induction, the inference, or the act of inferring, that what has been observed or established in respect to a part, individual, or…

Operating by induction; as, an inductive electrical machine.

xamination and punishment of heretics, fully established by Pope Gregory IX. in 1235. Its operations were chiefly confined to Spain, Portugal, and their dependencies, and a part of Italy.

To draw in by the operation of breathing; to inhale; -- opposed to expire. Forced to inspire and expire the air with difficulty. Harvey.

To subject to the operation of integration; to find the integral of.

The operation of finding the primitive function which has a given function for its differential coefficient. See Integral.

The amount or degree of energy with which a force operates or a cause acts; effectiveness, as estimated by results produced.

ometimes a burlesque, character; an interlude introduced between the acts of a play or an opera.

The method or operation of finding from a few given terms of a series, as of numbers or observations, other intermediate terms in conformity with the law of the series.