כּוּר
From LSJ
Μή, φίλα ψυχά, βίον ἀθάνατον σπεῦδε, τὰν δ' ἔμπρακτον ἄντλει μαχανάν → Oh! my soul do not aspire to eternal life, but exhaust the limits of the possible
English (Strong)
from an unused root meaning properly, to dig through; a pot or furnace (as if excavated): furnace. Compare כִּירַ֫יִם.