underfiring

Etymology 1
From, or.

Noun

 * 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) The state of not burning fuel at the desired level, and thus not providing heat efficiently.
 * 2)  Heating from below.
 * 3)  The state of being insufficiently fired or underfired.
 * 1) The state of not burning fuel at the desired level, and thus not providing heat efficiently.
 * 2)  Heating from below.
 * 3)  The state of being insufficiently fired or underfired.
 * 1)  Heating from below.
 * 2)  The state of being insufficiently fired or underfired.
 * 1)  Heating from below.
 * 2)  The state of being insufficiently fired or underfired.
 * 1)  The state of being insufficiently fired or underfired.
 * 1)  The state of being insufficiently fired or underfired.
 * 1)  The state of being insufficiently fired or underfired.
 * 1)  The state of being insufficiently fired or underfired.
 * 1)  The state of being insufficiently fired or underfired.

Etymology 2
From.