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ear to each other, or may be physically connected so that they revolve round their common center of gravity, and in the latter case are called also binary stars. -- Double time (Mil.). Same as Double-quick. -- Double window, a window having two sets of glazed sashes with an air space between them.

of one; -- said of a screw in which the pitch is equal to twice the distance between the centers of adjacent threads.

em five or six feet high, with numerous globose white fragrant flowers. The column in the center of the flower resembles a dove; -- called also Holy Spirit plant.

In the direction of gravity or toward the center of the earth; toward or in a lower place or position; below; -- the opposite of up.

Moving or extending from a higher to a lower place; tending toward the earth or its center, or toward a lower level; declivous. With downward force That drove the sand along he took his way. Dryden.

dance, to thrum. Tennyson . To dress to the right, To dress to the left, To dress on the center (Mil.), to form alignment with reference to the soldier on the extreme right, or in the center, of the rank, who serves as a guide.

ounts for material phenomena by a theory of dynamics. Those who would resolve matter into centers of force may be said to constitute the school of dynamists. Ward (Dyn. Sociol. ).

Deviating or departing from the center, or from the line of a circle; as, an eccentric or elliptical orbit; pertaining to deviation from the center or from true circular motion.

The ratio of the distance between the center and the focus of an ellipse or hyperbola to its semi-transverse axis.

ement of segmentation, in a peripheral position, and the cleavage process confined to the center of the egg; as, ectolecithal ova.

Excessive love and thought of self; the habit of regarding one's self as the center of every interest; selfishness; -- opposed to altruism.

ade; a market place; a mart; esp., a city or town with extensive commerce; the commercial center of a country. That wonderful emporium [Manchester] . . . was then a mean and ill- built market town. Macaulay. It is pride . . . which fills our streets, our emporiums, our theathers. Knox.

A centerpiece for table decoration, usually consisting of several dishes or receptacles of different sizes grouped together in an ornamental design.

A circle, whose center moves round in the circumference of a greater circle; or a small circle, whose center, being fixed in the deferent of a planet, is carried along with the deferent, and yet, by its own peculiar motion, carries the body of the planet fastened to it round its proper center. The schoolmen were like a…

ls, or belt pulleys, in which an arm, carrying one or more of the wheels, sweeps around a center lying in an axis common to the other wheels.

A circle around whose circumference a planet or the center of ann epicycle was conceived to move uniformly; -- called also eccentric equator.

resembles gearing used in equation clocks for showing apparent time. -- Equation of the center (Astron.), the difference between the place of a planet as supposed to move uniformly in a circle, and its place as moving in an ellipse. -- Equations of condition (Math.), equations formed for deducing the true values of…

the sun or of a planet (Astron.), the great circle whose plane passes through through the center of the body, and is perpendicular to its axis of revolution. -- Magnetic equator. See Aclinic.

the moon's motion is its orbit to the attraction of the sun, by which the equation of the center is diminished at the syzygies, and increased at the quadratures by about 1º 20'.

gradually wound upon the former, or unwound from it. See Involute. It is the locus of the centers of all the circles which are osculatory to the given curve or evolvent.