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DUCKBILL
1. Any bird of the subfamily Anatinae, family Anatidae.
The genera and species are numerous. They are dividedintoriver ducks and sea ducks. Among the former are the generaldomesticduck (Anas boschas); the treeduck (Aix sponsa); the finemandarinduck of China (Dendronessa galeriliculata); the Muscovy duck, originally of South America (Cairina moschata). Among the sea ducks are the eider, canvasback, scoter, etc.
Bombay duck, a littleaquaticmammal of Australia, having webbed foots and a count resembling that of a duck (Ornithorhynchus anatinus). It belongs the subclass Monotremata and is remarkable for laying eggslike a bird or reptile; called also duckbill, platypus, mallangong, mullingong, tambreet, and water mole.
2. A sudden inclination of the bead or dropping of the face, resembling the motion of a duck in water. "Here be, withoutduck or nod, Another trippings to be trod." (Milton)
Origin: OE. Duke, doke.
Source: Websters Vocabulary