In old Roman law. A name given to students of the civil law in the fourth year of their course, from their being supposed capable of solving any difficulty ip law. Tayl. Civil Law, 39. M 143 M M. This letter, used as a Roman numeral, stands for one thousand. It was also, in old English law, a brand or stigma impressed upon the brawn of the thumb of a person convicted of manslaughter and admitted to the benefit of clergy. This letter was sometimes put on the face of treasury notes of the United States, and signffies that the treasury note bears interest at the rate of one mill per centum, and not one per ¢entum interest. U.S. v. Hardyman, 13 Pet. 176, 10 L. Ed. 118. M. also stands as an abbreviation for several words of which it is the initial letter; as “Mary,” (the English queen of that name,) “Michaelmas,” “master,” “middle.” M. D. An abbreviation for “Middle District,” in reference to the division of the United States into judicial districts. Also an abbreviation for “Doctor of Medicine.” M. R. An abbreviation for “Master of the Rolls.” M.T. An abbreviation for “Michaelmas Term.”