M.R.I.A. Member of the Royal Irish Academy.
Mrs. Mistress.
MS. Manuscript;—MSS., Manuscripts.
M.S. Master in Surgery; Memoriæ Sacrum=Sacred to the Memory.
m.s. Months (after) sight.
M.S.C. Madras Staff Corps.
m.s.l. Mean sea-level.
M.S.S. Member of the Statistical Society.
mt. Mount;—mts., Mountains.
mth. Month.