2 definitions found From WordNet (r) 2.0 [wn]: whitethorn noun: thorny Eurasian shrub of small tree having dense clusters of white to scarlet flowers followed by deep red berries; established as an escape in eastern North America [syn: {English hawthorn}, {may}, {Crataegus laevigata}, {Crataegus oxycantha}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Whitethorn \White"thorn'\, noun (Bot.) The hawthorn.

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