laburnum

noun

1. any of several small trees belonging to the genus Laburnum, of the legume family, having elongated clusters of pendulous yellow flowers, especially L. alpinum, the Scotch laburnum.

noun

1. any leguminous tree or shrub of the Eurasian genus Laburnum, having clusters of yellow drooping flowers: all parts of the plant are poisonous

n.1570s, from Latin laburnum (Pliny), of unknown origin; perhaps from Etruscan.