The Proto-Indo-European word *pleth₂-
Word *pleth₂-
Meaning to spread out
See also Proto-Indo-European: *pl̥th₂w-ihₐ- ‘country, land’
Proto-Indo-European: *pl̥th₂ú- ‘wide, broad’
Synonyms *ster-

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