trigone
C2CEFR level
92/100Rarity: very rare
TechnicalRegister
The smooth triangular area of the bladder base bounded by the two ureteric orifices and the urethral opening.
The tumour was sited on the trigone, close to both ureteric orifices.
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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