adj, noun ·3 syllables ·Uncommon ·College level

Definitions

Noun

1. 1
   The drug phenobarbital. uncountable
2. 2
   a long-acting barbiturate used as a sedative wordnet

Adjective

1. 1
   of or pertaining to the lumen not-comparable
2. 2
   of or pertaining to the nature of light not-comparable
3. 3
   light-speed; having the speed of light (usually in the void) not-comparable

Synonyms

All synonyms

sodium thiopentalsodium thiopentalalcoholanalgesicanodynebarb

Antonyms

All antonyms

basalolateral

Etymology

Etymology 1

From Latin lumina (“lights”) + -al.

Etymology 2

From the brand name.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.