The Proto-Indo-European word *mak-
Word *mak-
Meaning long, thin
See also Phrygian: ΜΑΚΡΑΝ ‘long, tall, high’
Synonyms *dluh₂gʰó-, *ténus, *dl̥h₁ghós, *dlonghos, *kr̥k̂ós, *skidrós, *makrós, *seh₁ros

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

Other words that might be of interest
*mel- ‘strong, big’, *pau- ‘small’, *mei- ‘small’, *meĝ- ‘great’, *mreĝʰú- ‘short’, *were- ‘wide, broad’, *ānos ‘circle, ring’, *h₃érbʰis ‘circle, orb’, *wérhₓus ‘broad, wide’, *meĝha- ‘large, great’, *mr̥ĝhus ‘short’, *pau- ‘little, few’, *pl̥th₂ú- ‘wide, broad’