Etymology
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pyracanth (n.)

thorny evergreen shrub of the apple family, found in the south of Europe, bearing white flowers and scarlet berries, 1660s, from Modern Latin genus name Pyracantha, from Greek pyrakantha (Dioscorides), a plant named but not described, from pyr "fire" (from PIE root *paewr- "fire") + akantha, akanthos "thorn, thorny plant" (from PIE root *ak- "be sharp, rise (out) to a point, pierce").

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Definitions of pyracanth

pyracanth (n.)
any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries;
Synonyms: Pyracantha / fire thorn / firethorn
From wordnet.princeton.edu