Etymology
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laburnum (n.)

small, leguminous tree native to the Alps, 1570s, from Latin laburnum (Pliny), a word of unknown origin; perhaps from Etruscan.

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Definitions of laburnum

Laburnum (n.)
flowering shrubs or trees having bright yellow flowers; all parts of the plant are poisonous;
Synonyms: genus Laburnum
From wordnet.princeton.edu