/ Dictionary / Index P pneumatic pile: Meaning and Definition of Find definitions for: pneumat'ic pile' Pronunciation: [key] — Building Trades. Building Trades. a hollow pile, used under water, in which a vacuum is induced so that air and water pressure force it into place. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pneumatic duct pneumatics Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language