/ Dictionary / Index H helper T cell: Meaning and Definition of Find definitions for: helper T cell Pronunciation: [key] — Immunol. Immunol. a T cell that stimulates B cells to produce antibody against a foreign substance, using lymphokines or direct contact as a signal. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. helper helpful Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language