Source : Webster's Revised Unabridged Dictionary (1913)

Service \Serv"ice\, n., or Service \Serv"ice\ [Properly, the
   tree which bears serve, OE. serves, pl., service berries, AS.
   syrfe service tree; akin to L. sorbus.] (Bot.)
   A name given to several trees and shrubs of the genus
   {Pyrus}, as {Pyrus domestica} and {P. torminalis} of Europe,
   the various species of mountain ash or rowan tree, and the
   American shad bush (see {Shad bush}, under {Shad}). They have
   clusters of small, edible, applelike berries.

   {Service berry} (Bot.), the fruit of any kind of service
      tree. In British America the name is especially applied to
      that of the several species or varieties of the shad bush
      ({Amelanchier}.)