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undy

ˈundy, a. Her.
  [Anglicized f. undee a.]
  Wavy.

1592 W. Wyrley Armorie 9 The sonne of Thomas went away with his ancestors marke without distinction (being vndie golde and red). 1611 Cotgr., Vndé,..in Blason, vndie, or wauie. 1728 Chambers Cycl., Undee, or Undy, in Heraldry. See Wavy. 1780 Encycl. Brit. (ed. 2) V. 3588/1 Vert, a Chief undy Or. 1880 Encycl. Brit. XI. 694/1 A bend undy or wavy is not a mere bend with a wavy edge, but the whole bend is in waves.

Oxford English Dictionary

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