Definition of water spider
1a or water spinner : an aquatic European spider (Argyoneta aquatica) that constructs beneath the surface of the water a bell-shaped structure of silk which is open beneath and filled with air carried down by the spider in the form of small bubbles b : any of various spiders that habitually live on or about the water; especially : a large American spider (Dolomedes sexpunctatus) that runs rapidly on the surface of water
2 : water mite
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