Definition of water elm
: any of several trees of the family Ulmaceae that prefer or thrive in a moist environment: such as
a : american elm
b : winged elm
c : cedar elm
d : planer tree
e : a common Eurasian elm (Ulmus laevis) that closely resembles American elm
f : a tall spreading Japanese tree (Zelkova serrata) sometimes cultivated as an ornamental
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