/trang"kweuh luy'zeuhr/ , n.
1. a person or thing that tranquilizes.
2. a drug that has a sedative or calming effect without inducing sleep.
3. See antianxiety drug .
4. antipsychotic (def. 2).
Also, tranquillizer .
[ 1790-1800; TRANQUILIZE + -ER 1 ]