boiler Meaning, Definition & Usage

  1. noun sealed vessel where water is converted to steam
    steam boiler.
  2. noun a metal pot for stewing or boiling; usually has a lid
    kettle.

WordNet

Boil"er noun
Definitions
  1. One who boils.
  2. A vessel in which any thing is boiled. ✍ The word boiler is a generic term covering a great variety of kettles, saucepans, clothes boilers, evaporators, coppers, retorts, etc.
  3. (Mech.) A strong metallic vessel, usually of wrought iron plates riveted together, or a composite structure variously formed, in which steam is generated for driving engines, or for heating, cooking, or other purposes. ✍ The earliest steam boilers were usually spheres or sections of spheres, heated wholly from the outside. Watt used the wagon boiler (shaped like the top of a covered wagon) which is still used with low pressures. Most of the boilers in present use may be classified as plain cylinder boilers, flue boilers, sectional and tubular boilers.

Webster 1913