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Answer for the clue "A long-acting barbiturate used as a sedative ", 7 letters:
luminal

Word definitions for luminal in dictionaries

Wikipedia Word definitions in Wikipedia
Luminal may refer to: A trade name for the anti-epileptic drug phenobarbital Luminal (film) , a 2004 film by Italian director Andrea Vecchiato starring Denis Lavant "Luminal", a 2004 album by Sounds from the Ground In biology, pertaining to the lumen , ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
trade name of phenobarbitone, used as a sedative and hypnotic, coined 1912 in German from Latin lumen "light," related to lucere "to shine" (see light (n.)), + -al (3), "the root here being used, very irregularly, as an equivalent of pheno- [Flood].

Wiktionary Word definitions in Wiktionary
a. (context biology English) of or pertaining to the lumen n. (context medicine English) A sedative.

Usage examples of luminal.

It had, after all, a luminal computer with a quarter the power of DEUS!

Because his senses were attuned to energy fluctuations—such as those made by shrouded Jem’Hadar—he remained keenly aware of the twenty or so luminal demihumans who milled about the restaurant and dance floor of Vic Fontaine’s lounge.