grebePronunciation: /griːb/Definition of grebe noun a diving waterbird with a long neck, lobed toes, and almost no tail, typically having bright breeding plumage used in display. Family Podicipedidae: several genera Origin: mid 18th century: from French grèbe (term used in the Savoie region), of unknown origingrebe in other Oxford dictionaries Definition of grebe in the US English dictionary