Wiktionary:Word of the day/2021/December 29

Word of the day
for December 29
underfiring n
  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. (also attributively) Heating from below.
  4. (ceramics) The state of being insufficiently fired or underfired.
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