The Proto-Indo-European word *pélh₁us
Word *pélh₁us
Meaning much
See also Proto-Indo-European: *pelh₁- ‘fill’

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

Other words that might be of interest
*tóti ‘so much, many’, *pl̥h₁u-poik/k̂os ‘many-coloured, variegated’