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Results found in several dictionaries: Collins, Collaborative Dictionary
grimpeur, -euse 
  nm/f climber

Collaborative Dictionary     French-English
grimpeur pref. climber Reverso General Dictionary 
grimpeur exp. climbing Reverso General Dictionary 
grimpeurs nf. climbers Reverso General Dictionary 
grimpeuse nm. climber Reverso General Dictionary 
grimpeuses nmpl. climbers Reverso General Dictionary 
grimpeur cycliste pref. climber Reverso General Dictionary 
oiseau grimpeur pref. climbing bird Reverso General Dictionary 
oiseaux grimpeurs nf. climbing birds Reverso General Dictionary 

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