shearwater Syllabification: (shear·wa·ter)Pronunciation: /ˈSHi(ə)rˌwôtər, -ˌwätər/Definition of shearwater noun 1a long-winged seabird related to the petrels, often flying low over the surface of the water far from land. Family Procellariidae: three genera, in particular Puffinus, and many species 2North AmericanNorth American term for skimmer (sense 2).shearwater in other Oxford dictionaries Definition of shearwater in the British & World English dictionary