/ Dictionary / Index P postmill: Meaning and Definition of Find definitions for: post•mill Pronunciation: (pōst'mil"), [key] — n. a windmill with machinery mounted on a frame that turns in its entirety to face the wind. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. post meridiem postmillenarianism Related Content Daily Word Quiz: novice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language