BARBITAL Meaning of BARBITAL in English /bahr"bi tawl', -tal'/ , n. Pharm.a barbiturate compound, C 7 O 3 N 2 H 12 , formerly used as a hypnotic. [ 1915-20; BARBIT(URIC ACID) + (VERON)AL ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012