noun, masculine/vɛ.so/plural: vaisseaux
vaisseau is masculine in French.
ship, vessel; vessel (i.e. blood vessel)
Inherited from Middle French vaisseau, from Old French vaissel, from Late Latin vāscellum, diminutive of Latin vāsculum, diminutive of vās (“vessel”). Compare Occitan vaissèl, Catalan vaixell, Italian vascello.