LACUS TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.In. the eivil law. A lake; a receptacle of water which is never dry. Dig. 43, 14, 1, 3. In. old English law. Allay or alloy of silver with base metal. Fleta, lib. 1, c. 22, I 6. Related Posts:BASEAQUACANALFOSSAGOLDDIME