From kabash; a smelting furnace (as reducing metals) -- furnace.
see HEBREW kabash
כִּבְשָׁן noun masculine kiln, for lime or pottery (so Ki, AW; MishnaKel viii. 9; √ and original meaning dubious; according to Thes as subduing, reducing its contents, compare igne ferrum domatur PlinNat. Hist. 36. 27) — always absolute; only in הַכּ ׳קִיטוֺר Genesis 19:28 (J; simile of smoke of כִּכָּר, Sodom and Gomorrah); הַכּ ׳עֶשֶׁן Exodus 19:18 (E; simile of smoke of Sinai); כ ׳מִּיחַ ashes of kiln 9:8, compare 9:10 (both P).
כדד (√ of following; Arabic is toil severely; fatigue, weary, harass, tread; mortar in which things are pounded, bruised; what remains in bottom of cooking-pot).