Manx shearwater noun1 •A long-winged pelagic seabird, Puffinus puffinus, of the family Procellariidae.Manx shearwaters lounge on the sheeny swell before pattering along and coasting away on stiff, elongated wings. Keep your eyes peeled for a chocolate- and-oatcakecoloured version of the Manxie. — 2006 formsManx shearwaters