ˌthīōˈpen.ˌtal, -tȯl noun
( -s )
Etymology: thi- + penta- + -al
: a barbiturate C 11 H 18 N 2 O 2 S that is a sulfur analogue of pentobarbital and is used in the form of its yellowish white powdery sodium derivative as an intravenous anesthetic of short duration and also in psychotherapy