Hounsfield unit
C2CEFR level
98/100Rarity: very rare
TechnicalRegister
The quantitative scale of radiodensity used on CT, calibrated so that water measures zero and air measures minus one thousand.
A value of minus ninety Hounsfield units confirmed the adrenal nodule was a lipid-rich adenoma.
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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