| ASTEISMS | • asteisms n. Plural of asteism. • ASTEISM n. (Greek) refined irony. |
| MASSIEST | • massiest adj. Superlative form of massy: most massy. • MASSY adj. solid, full of mass. |
| MASTLESS | • mastless adj. Without a mast. • mastless adj. Bearing no mast (fruit of a tree). • MASTLESS adj. bearing no mast; as, a mastless oak or beech. |
| MESSIEST | • messiest adj. Superlative form of messy: most messy. • MESSY adj. dirty or untidy. |
| MESTESOS | • MESTESO n. (Spanish) a person of mixed ancestry, also MESTIZO, MESTINO. |
| METISSES | • metisses n. Plural of metisse. • METISSE n. (French) the (female) offspring of a white person and an American Indian. |
| MISSEATS | • misseats v. Third-person singular simple present indicative form of misseat. • MISSEAT v. to seat wrongly. |
| MISSIEST | • MISSY adj. like a miss. |
| MISSTEPS | • missteps v. Third-person singular simple present indicative form of misstep. • MISSTEP v. to make a wrong step. |
| MISTRESS | • mistress n. A woman, specifically one with great control, authority or ownership. • mistress n. A female teacher. • mistress n. The other woman in an extramarital relationship, generally including sexual relations. |
| MOSSIEST | • mossiest adj. Superlative form of mossy: most mossy. • MOSSY adj. covered with moss. |
| MOSTESTS | • MOSTEST n. (facetious) the most. |
| MUSSIEST | • mussiest adj. Superlative form of mussy: most mussy. • MUSSY adj. disarranged, rumpled. |
| SEAMSETS | • seam␣sets n. Plural of seam set. • SEAMSET n. a tool for flattening seams in metal etc. |
| STEMLESS | • stemless adj. Lacking a stem, either naturally or because it has been removed. • STEMLESS adj. without a stem. |
| STEMSONS | • stemsons n. Plural of stemson. • STEMSON n. a supporting timber of a ship. |