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iven straight line is constant; -- so called because it was conceived as described by the motion of one end of a tangent line as the other end was drawn along the given line.

A kind of shackle used for regulating the motions of a horse and making him amble.

or more cross grooves intersecting at the center, used on the end of a shaft to transmit motion to another shaft not in line with the first.

Motion in which all the points of the moving body have at any instant the same velocity and direction of motion; -- opposed to rotation.

drill (Mach.), a machine tool for drilling slots, in which the work or tool has a lateral motion back and forth; also, a drilling machine in which the spindle holder can be adjusted laterally.

A machine tool for drilling slots, in which the work or tool has a lateral motion back and forth; also, a drilling machine in which the spindle holder can be adjusted laterally.

Adjustable laterally; having a lateral motion, or a swinging motion; adapted for giving lateral motion. Traversing plate (Mil.), one of two thick iron plates at the hinder part of a gun carriage, where the handspike is applied in traversing the piece. Wilhelm. -- Traversing platform (Mil.), a platform for traversing g…

A trembling; a shivering or shaking; a quivering or vibratory motion; as, the tremor of a person who is weak, infirm, or old. He fell into an universal tremor of all his joints. Harvey.

Shaking; shivering; quivering; as, a tremulous limb; a tremulous motion of the hand or the lips; the tremulous leaf of the poplar.

A libration of the starry sphere in the Ptolemaic system; a motion ascribed to the firmament, to account for certain small changes in the position of the ecliptic and of the stars.

which the eyelashes, being turned in upon the eyeball, produce constant irritation by the motion of the lids.

A stone, block of wood, or anything else, placed under a wheel or barrel to prevent motion; a scotch; a skid. [Eng.] Wright.

Havingthree principal operative parts or motions, so as to produce a three-fold effect.

Latin word ante, or the first accented and the second unaccented, as in the English word motion; a choreus.

OF or pertaining to rotary motion; having power to draw out or turn round. "By art trochilic." Camden.

The science of rotary motion, or of wheel work. Wilkins.

t the same time. "The limbs move diagonally in pairs in the trot." Stillman (The Horse in Motion).

To put into confused motion; to disturb; to agitate. An angel went down at a certain season into the pool, and troubled the water. John v. 4. God looking forth will trouble all his host. Milton.

A racing stroke in which a double over-arm motion is used; -- so called from its use by an amateur named Trudgen, but often erroneously written trudgeon.

A motion as of something moving upon little wheels or rollers; a rolling motion.