noun, masculine/bu.lo/plural: bouleaux
birch tree
Inherited from Middle French, derived from Old French boul, bououl + -eau. The former from *betullus, alteration of Latin betulla, diminutive of Gaulish *betua, from Proto-Celtic *betwiyos, *betuyā (“birch”), from Proto-Indo-European *gʷet-. Compare Italian betulla, Catalan bedoll, Spanish abedul, Portuguese bétula, as well as Galician bídalo and bidueiro.