Definition of poison bush
: any of several poisonous or unwholesome Australian plants: a : a leguminous plant of Gastrolobium or the related genus Gompholobium with poisonous herbage b : a poisonous desert shrub (Myoporum deserti) c : poison pea; especially : darling pea d : a tree (Trema cannabina) that is injurious to livestock because of the large amount of fiber it contains
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