Definition of mealy tree in US English:

mealy tree

noun

  • Any of several viburnums characterized by the greyish pubescence of their twigs or the undersides of their leaves, especially the wayfaring tree, Viburnum lantana, of Eurasia.

Origin

Late 17th century; earliest use found in Stephen Skinner (bap. 1623, d. 1667), physician and philologist.