Webster’s Revised Unabridged Dictionary · 1913
Fining
Fin′ing (fīn′ĭng), n. 1. The act of imposing a fine.
2. The process of fining or refining; clarification; also (Metal.), the conversion of cast iron into suitable for puddling, in a hearth or charcoal fire.
3. That which is used to refine; especially, a preparation of isinglass, gelatin, etc., for clarifying beer.
Fining pot, a vessel in which metals are refined. Prov. xvii. 3.