/ Dictionary / Index H HTLV: Meaning and Definition of Find definitions for: HTLV Pronunciation: [key] human T-cell lymphotropic virus: any of a family of retroviruses associated with certain leukemias and immune system deficiencies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. HT HTLV-1 Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language