firebush \firebush\ n. 1. An evergreen South American shrub *{Streptosolen jamesonii}) having showy trumpet-shaped orange flowers; grown as an ornamental or houseplant. Syn: marmalade bush, {Streptosolen jamesonii}. [WordNet 1.5] 2. A densely branched Eurasian plant ({Bassia scoparia}) whose foliage turns purple-red in autumn; also called {burning bush}. Syn: summer cypress, burning bush, belvedere, {Bassia scoparia}, Kochia scoparia. [WordNet 1.5]