LATIN DICTIONARYLexicon Latīnum
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“radiant” in Latin

The English word radiant itself goes back to Latin radius, through radiāns.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

radiant
clarus: lucidus: illustris: splendidus: fulgens: nitidus, nitens. SYN. in BRIGHT.

Quick answer

What is the Latin word for radiant?
The usual Latin words for “radiant” are clārus, lūcidus, illūstris; also splendidus, fulgeō, nitidus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.