The Proto-Indo-European word *meĝha-
Word *meĝha-
Meaning large, great
See also Tocharian A: māk ‘many, much’
Avestan: mazaṇt- ‘great’
Synonyms *meĝ-, *meh₁ro-~moh₁ro-

Comments
Mallory J.P. and Adams D. (2006)

Other words that might be of interest
*mel- ‘strong, big’, *pau- ‘small’, *dluh₂gʰó- ‘long’, *mei- ‘small’, *ténus ‘long, thin’, *were- ‘wide, broad’, *ānos ‘circle, ring’, *dl̥h₁ghós ‘long’, *dlonghos ‘long’, *h₃érbʰis ‘circle, orb’, *wérhₓus ‘broad, wide’, *mak- ‘long, thin’, *pau- ‘little, few’, *makrós ‘thin, long’, *pl̥th₂ú- ‘wide, broad’, *seh₁ros ‘long’