/ Dictionary / Index A Archimedes' principle: Meaning and Definition of Find definitions for: Ar'chime'des' prin'ciple Pronunciation: [key] — Physics. Physics. the law that a body immersed in a fluid is buoyed up by a forceequal to the weight of the fluid displaced by the body. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Archimedes Archimedes' screw Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language