Definition of skimmer
noun
1a person or thing that skims, in particular. a utensil or device for removing a substance from the surface of a liquid. a device or craft designed to collect oil spilled on water. a hydroplane, hydrofoil, hovercraft, or other vessel that has little or no displacement when traveling.
2a long-winged seabird related to the terns, feeding by flying low over the water surface with its knifelike extended lower mandible immersed. - Genus Rynchops, family Rynchopidae (or Laridae): three species, one each in Africa, Asia, and America
3chiefly
North American a flat, broad-brimmed straw hat. informal a close-fitting dress.
4North American a broad-bodied dragonfly commonly found at ponds and swamps. It can rest for long periods on a perch, from which it darts out to grab prey. - Libellulidae and related families: several genera and numerous species, including the twelve-spotted skimmer(Libellula pulchella)