[fur-mer] 
| a narrow-bladed chisel for paring and mortising, driven by hand pressure or with a mallet. |
| fir·mer chisel (fûr'mər) n. 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.] |