[ waw-ter-toob, -tyoob, wot-er- ]
/ ˈwɔ tərˌtub, -ˌtyub, ˈwɒt ər- /
a boiler for generating steam by passing water in tubes (water tubes) through flames and hot gases.
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Compare fire-tube boiler.
Origin of water-tube boiler
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019