radiolucent
C2CEFR level
92/100Rarity: very rare
TechnicalRegister
Appearing dark on an X-ray because the structure allows radiation to pass through easily.
Gas in the bowel is radiolucent and shows as dark areas on the film.
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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