Etymology
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Luminal (n.)

trade name of phenobarbitone, used as a sedative and hypnotic, coined 1912 in German from Latin lumen "light" (from suffixed form of PIE root *leuk- "light, brightness") + -al (3), "the root here being used, very irregularly, as an equivalent of pheno-" [Flood].

luminal (adj.)

1897, "of or pertaining to a lumen," with -al (1).

updated on October 10, 2017

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Definitions of Luminal from WordNet

Luminal (n.)
a long-acting barbiturate used as a sedative;
Synonyms: sodium thiopental / phenobarbital / phenobarbitone / purple heart
From wordnet.princeton.edu, not affiliated with etymonline.