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Definition of Prickly ash
1. Noun. Any of a number of trees or shrubs of the genus Zanthoxylum having spiny branches.
Group relationships: Genus Zanthoxylum, Zanthoxylum
Specialized synonyms: Sea Ash, Toothache Tree, Zanthoxylum Americanum, Zanthoxylum Fraxineum, Hercules'-club, Hercules'-clubs, Hercules-club, Zanthoxylum Clava-herculis
Generic synonyms: Tree
Specialized synonyms: Sea Ash, Toothache Tree, Zanthoxylum Americanum, Zanthoxylum Fraxineum, Hercules'-club, Hercules'-clubs, Hercules-club, Zanthoxylum Clava-herculis
Generic synonyms: Tree
2. Noun. Australian tree having alternate simple leaves (when young they are pinnate with prickly toothed margins) and slender axillary spikes of white flowers.