LS -abbr

  1. left side
  2. letter signed
  3. library science
  4. place of the seal

LSD [,el-(,)es-'dē] -n

  1. a semisynthetic illicit organic compound C 20H 25N 3O derived from ergot that induces extreme sensory distortions, altered perceptions of reality, and intense emotional states, that may also produce delusions or paranoia, and that may sometimes cause panic reactions in response to the effects experienced called also lysergic acid diethylamide

LSI -abbr

  1. large-scale integrated circuit; large-scale integration

LSM -abbr

  1. letter-sorting machine

LSO -abbr

  1. landing signal officer

LSS -abbr

  1. lifesaving service; lifesaving station
  2. life-support system

LST -abbr

  1. landing ship, tank
  2. local sidereal time