/ Dictionary / Index B black stem: Meaning and Definition of Find definitions for: black' stem' Pronunciation: [key] — Plant Pathol. Plant Pathol. a disease of plants, characterized by blackened stems and defoliation, caused by any of several fungi, as Ascochyta imperfecta or Mycosphaerella lethalis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. black squirrel Blackstone Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language