underfiring

Meanings

1. Intentional operation of a boiler, furnace, oven, etc., at a low level.
2. The state of not burning fuel at the desired level, and thus not providing heat efficiently.
3. Heating from below.
4. The state of being insufficiently fired or underfired.

1. present participle and gerund of underfire

Etymology

From under- (prefix meaning ‘beneath; insufficient’) + firing, or underfire + -ing (suffix forming nouns from verbs denoting the act of doing something, an action, or the embodiment of an action).