Standard Lemma guide

downcomer

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

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Pronunciation

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1

noun

Meaning 1

A pipe to conduct something downwards.

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.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A pipe to conduct something downwards.

A pipe for leading the hot gases from the top of a blast furnace downward to the regenerators, boilers, etc.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From down + comer.