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water-spider

ˈwater-ˌspider
  An aquatic spider of either of the genera Argyroneta or Dolomedes. In early use applied loosely to insects that move swiftly on the surface of water.

1552 Elyot's Dict., Tipula,..a water spider. 1626 Bacon Sylva §696 The Water-Spider that hath six Legs. 1710 Ray Hist. Insect. 71 De Tipula. The Water-Spider. c 1711 Petiver Gazophyl. i. Tab. 9 It's much slenderer and less than the common Water-Spider. 1774 Goldsm. Nat. Hist. VII. 263 The Water-spider..resembles the common spider in its appearance, except that its hinder part is made rather in the shape of a nine-pin than a ball. 1854 A. Adams etc. Man. Nat. Hist. 271 The diving-bell of the Water-Spider (Argyroneta aquatica). 1897 Edin. Rev. July 174 The water-spider, if but a day old, dives into the water.

Oxford English Dictionary

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