Dictionary

demandeur

/də.mɑ̃.dœʁ/

noun, masculine/də.mɑ̃.dœʁ/plural: demandeurs

asker or requester (one who asks or requests something); seeker

From demander + -eur.

noun, masculine/də.mɑ̃.dœʁ/plural: demandeurs

complainant, plaintiff (one who brings a lawsuit against another)

From demander + -eur.