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From Biology-Online Dictionary | Biology-Online Dictionary
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1. (Science: chemistry) A round pit of stone, lined with clay, for receiving the metal on its first fusion.

2. The cistern or reservoir made at the lowest point of a mine, from which is pumped the water which accumulates there.

3. A pond of water for salt works.

4. A puddle or dirty pool. Sump fuse, a fuse used in blasting under water.

(Science: chemical) Sump men, the men who sink the sump in a mine.

Origin: Cf. G. Sumpf a sump in a mine, a swamp, akin to LG. Sump, D. Somp a swamp, Dan. & Sw. Sump, and perhaps to E. Swamp.