- M M ([e^]m).
1. M, the thirteenth letter of the English alphabet, is a
vocal consonant, and from the manner of its formation, is
called the labio-nasal consonant. See Guide to
Pronunciation, [sect][sect] 178-180, 242.
Note: The letter M came into English from the Greek, through the Latin, the form of the Greek letter being further derived from the Ph[oe]nician, and ultimately, it is believed, from the Egyptian. Etymologically M is related to n, in lime, linden; emmet, ant; also to b. [1913 Webster] M is readily followed by b and p. the position of the lips in the formation of both letters being the same. The relation of b and m is the same as that of d and t to n. and that of g and k to ng. [1913 Webster]
The Collaborative International Dictionary of English. 2000.