Webster's English Dictionary

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philadelphus

phil.a.del.phus \.fil-*-'del-f*s\ n [NL, genus name, fr. Gk philadelphos 
   brotherly, fr. phil- + adel]phos brother - more at -ADELPHOUS : any of a 
   genus of ornamental shrubs of the saxifrage family widely distr ibuted in 
   temperate regions