/ Dictionary / Index P plant pathology: Meaning and Definition of Find definitions for: plant' pathol"ogy Pronunciation: [key] the branch of botany dealing with diseases of plants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plant louse plantsman Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language