/ Dictionary / Index N nitrosourea: Meaning and Definition of Find definitions for: ni•tro•so•u•re•a Pronunciation: (nī-trō"sō-yoo-rē'u), [key] — n. Pharm. any of various lipid-soluble, synthetic or naturally occurring alkylating agents that can cross the blood-brain barrier: used in the treatment of certain brain cancers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nitroso group nitrostarch Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language