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boiler (n.)

1540s, "person who boils," agent noun from boil (v.). Meaning "vessel for boiling" is from 1725; specific sense "strong metallic structure in which steam is generated for driving engines" is from 1757.

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Definitions of boiler from WordNet

boiler (n.)
sealed vessel where water is converted to steam;
Synonyms: steam boiler
boiler (n.)
a metal pot for stewing or boiling; usually has a lid;
Synonyms: kettle
From wordnet.princeton.edu