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An instrument which by means of a prism of a peculiar form, or an arrangement of mirrors, causes an apparent image of an external object or objects to appear as if projected upon a plane surface, as of paper or canvas, so that the outlines may conveniently traced. It is generally used with the microscope.…

An apparatus in which the image of an external object or objects is, by means of lenses. thrown upon a sensitized plate or surface placed at the back or an extensible darkened box or chamber variously modifled; -- commonly called simply the camera.

Divination by means of the ascent or motion of smoke.

resent, or more esp. the amount of carbon dioxide, by its action on limewater or by other means.

o cards. -- To have the cards in one's own hands, to have the winning cards; to have the means of success in an undertaking. -- To play one's cards well, to make no errors; to act shrewdly. -- To play snow one's cards, to expose one's plants to rivals or foes. -- To speak by the card, to speak from information and…

To bear (one's self); to behave, to conduct or demean; -- with the refexive pronouns. He carried himself so insolently in the house, and out of the house, to all persons, that he became odious. Clarendon.

the agent is apparenty left unchanged; as, the catalysis of making ether from alcohol by means of sulphuric acid; or catalysis in the action of soluble ferments (as diastase, or ptyalin) on starch.

A form of instruction by means of questions answers.

Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.

To unite or cause to adhere by means of a cement. Bp. Burnet.

The state of being central; tendency towards a center. Meantime there is a great centrality, a centripetence equal to the centrifugence. R. W. Emerson.

r rounded body lying near the nucleus of a cell. It is regarded as the dynamic element by means of which the machinery of cell division is organized.

ed; indeterminate; indefinite; one or some; -- sometimes used independenty as a noun, and meaning certain persons. It came to pass when he was in a certain city. Luke. v. 12. About everything he wrote there was a certain natural grace und decorum. Macaulay. For certain, assuredly. -- Of a certain, certainly.…

An order of marine mammals, including the whales. Like ordinary mammals they breathe by means of lungs, and bring forth living young which they suckle for some time. The anterior limbs are changed to paddles; the tail flukes are horizontal. There are two living suborders: (a) The Mysticete or whalebone whales, having n…

Small money; the money by means of which the larger coins and bank bills are made available in small dealings; hence, the balance returned when payment is tendered by a coin or note exceeding the sum due.

A gear by means of which the speed of machinery or of a vehicle may be changed while that of the propelling engine or motor remains constant; -- called also change-speed gear.

That through which anything passes; means of passing, conveying, or transmitting; as, the news was conveyed to us by different channels. The veins are converging channels. Dalton. At best, he is but a channel to convey to the National assembly such matter as may import that body to know. Burke.

Divination by means of apperances in the air.

The art or means of characterizing; a system of signs or characters; symbolism; distinctive mark. Fairies use flowers for their charactery. Shak.

A kind of joint by which an overlap joint is changed to a flush joint, by means of a gradually deepening rabbet, as at the ends of clinker-built boats.