Definition 1: A waterhole near a stream filled only during floods.
Definition 2: A part of a river or creek that dries up after the rainy season.
[@more@]Usage 2: A common term in Australia but not used in Great Britain or North America.
Suggested usage: Usage in Australia is usually pretty narrow and usage elsewhere in the English-speaking world would be a ground-breaking event. If you really want to break new ground, test something like: "1985 was a positive billabong for Fran in an otherwise gushing career." Be ready to explain.
Etymology: From Wiradjuri (Australian Aboriginal): "an arroyo, a stream that runs only when it rains", from bila "river" + -bang.
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