supplied with fuel or heat from beneath.
Origin of underfired
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for underfired
Historical Examples of underfired
A body which is underfired will almost certainly cause the glaze to crawl.
Matt glazes are not underfired glazes nor are they deadened by acid or sand blast.