radiopaque
C2CEFR level
85/100Rarity: very rare
TechnicalRegister
Appearing white on an X-ray because the structure absorbs, rather than transmits, radiation.
The swallowed coin was clearly radiopaque against the softer surrounding tissue.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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