One whose business it is to make assays of the precious metals. Assayer of the king. An officer of the royal mint, appointed by St 2 Hen. VI. c. 12. who received and tested the bullion taken in for coining; also called “assayator regis” Cowell ; Termes de la Ley.
ASSAYER
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.