tranquilizante
tranquilizer
tranquil
calm, peaceful
+
-izante
agent noun suffix
Tranquilizante means tranquilizer. It combines the English word tranquil0 (calm, peaceful0) with the -izante1 suffix (agent noun suffix1), literally meaning 'something that makes tranquil'.
noun
  1. tranquilizer
    A drug or substance that reduces anxiety or tension.
    El médico le recetó un tranquilizante para ayudarle a dormir. // The doctor prescribed a tranquilizer to help him sleep.
adjective
  1. calming
    Having a calming or soothing effect.
    La música suave tiene un efecto tranquilizante. // Soft music has a calming effect.