luminal

From Latin lumina (“lights”) +‎ -al.

luminal (not comparable)

1. (biology) of or pertaining to the lumen
2. (physics) of or pertaining to the nature of light
3. (physics) light-speed; having the speed of light (usually in the void)

• (physics): lumic

• (antonym(s) of “biology”): basalolateral

• (biology): transluminal, interluminal
• (physics): subluminal, superluminal

From the brand name.

luminal (uncountable)

1. (medicine) The drug phenobarbital.

• (medicine): sodium thiopental

• Maullín

Borrowed from German Luminal or French luminal.

luminal n (uncountable)

1. luminal

luminal m or f (masculine and feminine plural luminales)

1. luminal

luminal m (plural luminales)

1. luminal