The Collaborative International Dictionary of English v.0.48:
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 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