The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
men-2
DEFINITION:
To project. Derivatives include mouth, menace, and mountain. 1. Suffixed zero-grade form *m-to- in a western Indo-European word for a projecting body part, variously “chin, jaw, mouth.” a.mouth, from Old English mth, mouth, from Germanic *munthaz;b.mental2, from Latin mentum, chin. 2.menace, minacious; amenable, demean1, promenade, from Latin minae, projecting points, threats. 3.eminent, imminent, prominent, promontory, from Latin -minre, to project, jut, threaten. 4. Suffixed o-grade form *mon-ti-.mons, Montagnard, montane, monte, monticule, mount1, mount2, mountain; amount, ultramontane, from Latin mns (stem mont-), mountain. (Pokorny 1. men- 726, 2. menth- 732.)
-to- in a western Indo-European word for a projecting body part, variously “chin, jaw, mouth.” a. mouth, from Old English m
th, mouth, from Germanic *munthaz; b. mental2, from Latin mentum, chin. 2. menace, minacious; amenable, demean1, promenade, from Latin minae, projecting points, threats. 3. eminent, imminent, prominent, promontory, from Latin -min
re, to project, jut, threaten. 4. Suffixed o-grade form *mon-ti-. mons, Montagnard, montane, monte, monticule, mount1, mount2, mountain; amount, ultramontane, from Latin m
ns (stem mont-), mountain. (Pokorny 1. men- 726, 2. menth- 732.) 
