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A chisel or gouge with a thin blade, used to shape and finish wood by hand.
[French fermoir, from Old French, alteration (influenced by fermer, to make firm) of formoir, from former, to form, from Latin fōrmāre, from fōrma, form.]
(Tools) a chisel or gouge with a thin blade, used on wood. Sometimes shortened to: firmer
fir′mer chis`el(ˈfɜr mər)
a narrow-bladed chisel for paring and mortising that is driven by hand pressure or with a mallet.
[1680–90; firmer < French fermoir, b. formoir that which forms (derivative of former to form < Latin formāre) and fermer to make firm (< Latin firmāre)]