LSD-25 noun1 •LSD (lysergic acid diethylamide).1956, M. W. Hirsch, M. E. Jarvik, and H. A. Abramson, "Lysergic acid diethylamide (LSD-25): Effects of LSD-25 and six related drugs upon handwriting", in Journal of Psychology, volume 41, pages 11–22. — 1956