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13th letter, from Greek mu, from Semitic mem. The Roman symbol for 1,000; sometimes used in this sense in English 15c.-16c.; but in late 20c. newspaper headlines it stands for million. As a thickness of type, from 1680s.
m- abbr. often m-
mu (myōō, mōō)
Symbol μ The 12th letter of the Greek alphabet. adj.
Of, relating to, or being a polypeptide chain that is one of five types of heavy chains present in immunoglobins.
Abbreviation of mass, meter