fining

Noun

fin=ing

CIDE DICTIONARY

fining, n.

The act of imposing a fin1913 Webster]
The process of fining or refining; clarification; also (Metal.), the conversion of cast iron into suitable for puddling, in a hearth or charcoal fire. [1913 Webster]
That which is used to refine; especially, a preparation of isinglass, gelatin, etc., for clarifying beer. [1913 Webster]

Fining pot, a vessel in which metals are refined. Prov. xvii. 3.

For further exploring for "fining" in Webster Dictionary Online