Describing a reverberatory furnace used to make steel, usually in mass-produced quantities. / Designating the steel so produced.

(historical) Any of several taxes levied in medieval Europe based on the number of hearths (fireplaces) in a property or community.

ore hearth

A low furnace in which rich lead ore is reduced.

plural of hearth tax

A light portable furnace for heating rivets.

An open hearth furnace (open-hearth furnace). / A home hearth comprising a hearthstone alone, as opposed to one comprising a hearthstone and fireplace or oven.

Alternative form of open-hearth (open compound attributive form)

A flat stone used to form a hearth. / (by extension) The fireside, home life. / A soft kind of stone used to whiten doorsteps, scour floors, etc.

(transitive) To scour, as a floor, with hearthstone.