/ Dictionary / Index D diisobutyl phthalate: Meaning and Definition of Find definitions for: di•i•so•bu•tyl phthal•ate Pronunciation: (dī-ī'sō-byt'l thal'āt, fthal'-, -ī"sō-), [key] — Chem. Chem. a clear, colorless liquid, CHO, used chiefly as a plasticizer for nitrocellulose. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diiodomethane Dijon Related Content Daily Word Quiz: kiln Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language