Prickly Ash is a name given to several prickly shrubs of the USA, genus Xanthoxylum, family Rutaceae. They have an aromatic and pungent bark which is used as a remedy for toothache, giving rise to the name of toothache- tree. Found on http://www.probertencyclopaedia.com/browse/BPA.HTM
[n] - any of a number of trees or shrubs of the genus Zanthoxylum having spiny branches 2. [n] - Australian tree having alternate simple leaves (when young they are pinnate with prickly toothed margins) and slender axillary spikes of white flowers Found on http://www.webdictionary.co.uk/definition.php?query=prickly%20ash
noun Australian tree having alternate simple leaves (when young they are pinnate with prickly toothed margins) and slender axillary spikes of white flowers Found on https://www.encyclo.co.uk/local/20974
Also calleda citrus shrub or small tree, Zanthoxylum americanum, having aromatic leaves and usually prickly branches. · Hercules-club (def. 2). Found on https://www.infoplease.com/dictionary/prickly-ash