Word forms "boiling tube":
singular boiling tube plural boiling tubes sciencea glass container used in scientific experiments, consisting of a wide tube that is open at one end only. Boiling tubes are similar to test tubes but they are larger.
English dictionary. 2014.
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boiling tube — UK US noun [countable] [singular boiling tube plural boiling tubes] science a glass container used in scientific experiments, consisting of a wide tube that is open at one end only. Boiling tubes are similar to test tubes but they are larger … Useful english dictionary
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Fire-tube boiler — A fire tube boiler is a type of boiler in which hot gases from the fire pass through one or more tubes within the boiler. It is one of the two major types of boilers, the other being the water tube boiler. A fire tube boiler can be either… … Wikipedia