water-hole noun. ['wɔ:tǝhǝʊl] L17.
[from WATER noun + HOLE noun¹.]
1. A hole or depression in which water collects; a pond, a pool; a cavity in the bed of a river, esp. one that retains water when the river itself is dry; this as regularly drunk from by animals. L17.

2. Astronomy. The part of the radio spectrum between the frequencies of hydrogen atoms and hydroxyl radicals. L20.

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