/ Dictionary / Index D dew point: Meaning and Definition of Find definitions for: dew' point" Pronunciation: [key] the temperature to which air must be cooled, at a given pressure and water-vapor content, for it to reach saturation; the temperature at which dew begins to form. Also calledCf. absolute humidity, mixing ratio, relative humidity, specific humidity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dew plant dew-point spread Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language