downcomer

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noun

A large external pipe in a water-tube boiler, carrying unheated water from the steam drum down to the water drum as part of the circulation path.

Scrabble 17
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Meanings

noundowncomer (plural downcomers)

plural downcomers

  1. A pipe to conduct something downwards.
    1. A large external pipe in a water-tube boiler, carrying unheated water from the steam drum down to the water drum as part of the circulation path.
    2. A pipe for leading the hot gases from the top of a blast furnace downward to the regenerators, boilers, etc.

Origin

From down + comer.

Full word history & related roots →
Cite this entry
APA

downcomer. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/downcomer

MLA

“downcomer.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/downcomer. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “downcomer,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/downcomer.

Source: downcomer on Wiktionary, CC BY-SA 4.0.