[n] a branch of a river running to a dead end
[n] (Australian) a stagnant pool of water in the bed of a stream that flows intermittently
Misc. Definitions
\Bil"la*bong`\, n. [Native name.] In Australia, a blind channel leading out from a river; -- sometimes called an {anabranch}. This is the sense of the word as used in the Public Works Department; but the term has also been locally applied to mere back-waters forming stagnant pools and to certain water channels arising from a source.