This base type stems from lat. cōlare 'to sieve, to strain', which is derived from lat. colum 'sieve' (cf. DELI 2, 250 f.). Apart from the terminology used in metal processing, it is also a common technical term, especially in the dairy industry, which refers to 'straining the milk'; cf. fra. couler, ita. colare, roh. cular, lld. corè (with a rhotacism from -l- zu -r-) etc.; (cf. FEW 2, 877 under colare).