different between radioactive vs radiant

English

Alternative forms

• radio-active (dated)

Etymology

Coined by Pierre Curie and Marie Curie in 1898 as French radio-actif, equivalent to English radio- +? active.

Pronunciation

• (Received Pronunciation) IPA^(key): /??e?dio??akt?v/
• (US) IPA^(key): /??e?dio??ækt?v/
• Rhymes: -ækt?v

Adjective

radioactive (comparative more radioactive, superlative most radioactive)

1. Exhibiting radioactivity.
2. (figuratively, rare) Dangerous and disgusting, particularly of people or ideas.

   (The addition of quotations indicative of this usage is being sought:)

Derived terms

• nonradioactive
• radioactively

Translations

Noun

radioactive (plural radioactives)

1. Any radioactive substance.
   • 2016, Travis S. Taylor, Les Johnson, On to the Asteroid

     Any ship nearby will receive a lethal dose of gamma rays, neutrons, and other radioactives.

Further reading

• “radioactive”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.
• radioactive on Wikipedia.Wikipedia

French

Adjective

radioactive

1. feminine singular of radioactif

English

Etymology

From Middle French radiant, from Latin radians, radiantis, present participle of radiare (“to emit rays or beams”).

Pronunciation

• IPA^(key): /??e?di.?nt/

Adjective

radiant (comparative more radiant, superlative most radiant)

1. Radiating light and/or heat.

2. Emitted as radiation.
3. Beaming with vivacity and happiness.

   • His sister, Mrs. Gerard, stood there in carriage gown and sables, radiant with surprise. ¶ “Phil?!  You?!  Exactly like you, Philip, to come strolling in from the antipodes—dear fellow?!” recovering from the fraternal embrace and holding both lapels of his coat in her gloved hands.

4. Emitting or proceeding as if from a center.
5. (heraldry) Giving off rays; said of a bearing.

6. (botany) Having a ray-like appearance, like the large marginal flowers of certain umbelliferous plants; said also of the cluster which has such marginal flowers.

Translations

Noun

radiant (plural radiants)

1. A point source from which radiation is emitted.
2. (astronomy) The apparent origin, in the night sky, of a meteor shower.
3. (geometry) A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.

Translations

Anagrams

• anti-rad, antirad, intrada, itardan

French

Pronunciation

Verb

radiant

1. present participle of radier

Latin

Verb

radiant

1. third-person plural present active indicative of radi?

Romanian

Etymology

From French radiant.

Adjective

radiant m or n (feminine singular radiant?, masculine plural radian?i, feminine and neuter plural radiante)

1. radiant

Declension