/ Dictionary / Index D deratization: Meaning and Definition of Find definitions for: de•rat•i•za•tion Pronunciation: (dē-rat"u-zā'shun), [key] — n. extermination of rats, esp. aboard a merchant vessel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. deration deratize Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language