Artificial intelligent assistant

beam-tree

ˈbeam-tree
  [Improper shortening of white-beam (tree), so called from the white under-surface of its leaves, which strikingly characterize it in a wind.]
  A tree (Pyrus Aria) related to the Apple, Pear, and Wild Service, bearing flat corymbs of flowers, succeeded by rich scarlet berries.

1800 Sir J. Smith Eng. Flora (1828) II. 366 Pyrus Aria, White Beam-tree, White Wild Pear-tree. 1830 Lindley Nat. Syst. Bot. 84 The timber of the Beam-tree is invaluable for axletrees. 1879 Prior Plant-n. 16 Without the White prefixed..Beam-tree is a silly pleonasm, a tree-tree.

Oxford English Dictionary

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