noun, plural M-1's.
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Example sentences from the Web for M-1
In several specimens, however, the re-entrant fold is absent from the lingual surface of M1.North American Jumping Mice (Genus Zapus)|Philip H. Krutzsch
Of these parts, right m2, left coronoid process, right P4 and M1 and adjacent part of maxilla are lost.American Weasels|E. Raymond Hall
At this stage, the occlusal configuration would be in a U-pattern (m1 in Fig. 5E).
M1 and M2, like the lower molars, are elliptical in cross-section.
In addition there is a rostrum that on the right side bears the last two unicuspids, P4, M1, and M2.Pleistocene Soricidae from San Josecito Cave, Nuevo Leon, Mexico|James S. Findley