/ Dictionary / Index A Atwood's machine,: Meaning and Definition of Find definitions for: At'wood's machine" Pronunciation: [key] — Physics. Physics. a device consisting of two unequal masses connected by a string passed over a pulley, used to illustrate the laws of motion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Atwood at. wt. Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language