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water-tube boiler

[waw-ter-toob, -tyoob, wot-er-]
noun
  1. a boiler for generating steam by passing water in tubes (water tubes) through flames and hot gases.
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Origin of water-tube boiler

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018