Source : Webster's Revised Unabridged Dictionary (1913)

Guelderrose' \Guel"der*rose'\, n. [Supposed to be brought from
   Guelderland; hence, D. Geldersche roos, G. Gelderische rose,
   F. rose de Gueldre, It. rose di Gueldra, Sp. rosa de
   Gueldres.] (Bot.)
   A cultivated variety of a species of {Viburnum} ({V.
   Opulus}), bearing large bunches of white flowers; -- called
   also {snowball tree}.