/ Dictionary / Index P primary phloem: Meaning and Definition of Find definitions for: pri'mary phlo'em Pronunciation: [key] — Bot. Bot. phloem derived directly from the growth of an apical meristem. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. primary optical area primary process Related Content Daily Word Quiz: verdant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language