laburnum Meaning, Definition & Usage

  1. noun flowering shrubs or trees having bright yellow flowers; all parts of the plant are poisonous
    genus Laburnum.

WordNet

La*bur"num noun
Etymology
L.
Definitions
  1. (Bot.) A small leguminous tree (Cytisus Laburnum), native of the Alps. The plant is reputed to be poisonous, esp. the bark and seeds. It has handsome racemes of yellow blossoms. ✍ Scotch laburnum (Cytisus alpinus) is similar, but has smooth leaves; purple laburnum is C. purpureus.

Webster 1913