from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load.
- n. A wheel turned by or driving a belt.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One of the simple machines; a wheel with a grooved rim in which a pulled rope or chain will lift an object (more useful when two or more pulleys are used together such that a small force moving through a greater distance can exert a larger force through a smaller distance).
- v. To raise or lift by means of a pulley.
from the GNU version of the Collaborative International Dictionary of English
- n. A wheel with a broad rim, or grooved rim, for transmitting power from, or imparting power to, the different parts of machinery, or for changing the direction of motion, by means of a belt, cord, rope, or chain.
- transitive v. To raise or lift by means of a pulley.
from The Century Dictionary and Cyclopedia
- n. Properly, a simple machine consisting of a wheel having a grooved rim for carrying a rope or other line, and turning in a frame, which, when movable, is termed a pulley-block.
- n. A block containing several grooved wheels.
- n. A tackle or apparatus consisting of one or more pulley-blocks with a rope or ropes reeved through them for use in hoisting.
- n. In anatomy: A trochlea, or trochlear surface of an articulation.
- n. A ligamentous loop which confines or changes the direction of the tendon of a muscle passing through it: as, the digastric muscle of the chin and the superior oblique of the eye both pass through a pulley. See cuts under muscle and eye.
- To raise or hoist with a pulley.
- n. A pulley which merely tightens the belt but takes off no power.
- n. A pulley built up of segments or sectors.
- n. A segmental pulley; a pulley made in two or more sectors for convenience in casting.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
Middle English poley, from Old French polie and from Medieval Latin poliva, both ultimately from Greek polos, axis; see kwel-1 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English polley, pullie, from Old French poulie, polie ("a pulley"), (compare Medieval Latin polea, polegia, polegium; Middle Dutch puleye), of Germanic origin, from or related to Middle Low German pulen ("to pull"), Old English pullian ("to pull") . More at pull. (Wiktionary)