Meanings
comparative more radiopaque · superlative most radiopaque
- Impenetrable to X-rays and other radiation.
We may coin the word ‘radiopaque’, and it would definitely mean ‘impervious to the X-ray’.[…]. From radiopaque we would likewise have the useful term radiopacity.
[1917, R. Ottolengui, Dental Items of Interest, volume 39, quoted in OED, Dental Items of Interest Publishing Company, page 143Antonyms: radiolucent
Synonyms & antonyms
adjectiveImpenetrable to X-rays and other radiation.
More synonyms by meaning
adjectivenot transparent to X-rays or other forms of radiation
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
- Latinradius
- Englishradi-
- Latinopacus
- Middle Englishopake
- Middle Frenchopaqueinflu.
- Englishopaque
- Englishradiopaque
From radi- (staff) + opaque. First attested in 1917.
Full word history & related roots →Rhymes & wordplay
Rhymes with radiopaque
Cite this entry
radiopaque. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/radiopaque
“radiopaque.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/radiopaque. Accessed November 4, 2026.
WatkinsX Dictionary, s.v. “radiopaque,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/radiopaque.
Source: radiopaque on Wiktionary, CC BY-SA 4.0.