Wiktionary
water strider
n. Any of a number of predatory insects in the family ''(taxlink Gerridae family noshow=1), which rely on surface tension to walk on top of water.
WordNet
water strider
n. long-legged bug that skims about on the surface of water [syn: pond-skater, water skater]
Usage examples of "water strider".
For all his gawkiness, he moved with the light, random swiftness of a water strider on a hot day.