Serv·ice n., or Serv·ice.  Bot. A name given to several trees and shrubs of the genus Pyrus, as Pyrus domestica and Pyrus 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.)