Definition of service tree in US English:

service tree

noun

  • A Eurasian tree of the rose family, closely related to the rowan.

    Genus Sorbus, family Rosaceae: the southern European true service tree (S. domestica), with compound leaves and green-brown fruits that are edible when overripe, and the wild service tree (S. torminalis), with lobed leaves and brown berries

Origin

Mid 16th century: service from an alteration of the plural of obsolete serve, from Old English syrfe, based on Latin sorbus.