| L1, | L2, L3, L4, L5 first, second, third, fourth, and fifth lumbar vertebrae |
|---|---|
| LIFO | last in, first out |
| M-I | first meiotic metaphase |
| M1 | mitral first [sound]; myeloblast; slight dullness |
| 3-M [syndrome] | initials for Miller, McKusick, and Malvaux, who first described the syndrome |