Meaning of fire-tube boiler

fire'-tube boil"er

Pronunciation: (fīr'tb", -tyb"), [key]
  1. any boiler for generating steam by passing hot gases and other combustible products through tubesimmersed in water to a chimney or uptake. Cf. water-tube boiler.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.