noun, masculine/ʒy.vɛ.ɲœʁ/plural: juveigneurs
a younger or youngest son of a nobleman who is given apanage
“Les cadets se retrouvent sans grandes ressources alors que le droit coutumier breton leur accorde l'égalité et même favorise le juveigneur c'est-à-dire le plus jeune fils.” — The younger siblings find themselves quite impoverished, even though Breton customary law grants them equality, and even favours the juveigneur, that is the youngest son.
Related: juveigneurie
Inherited from Middle French juveigneur, from Old French juvegnor, from Latin iuveniōrem (which also developed into Latin iūnior).