1. levor — de Vaan
levor 'id.' (Lucr.-l··)* Pit *leju- » *leiw-i-. PIE ^lehii-u- 4smooth'. IE cognates: Gr. λείος [adj.] 'level, smooth' < *Iehii-u-o-, λίς, gen. λιτός [adj\] 'smooth \ [m.] 'smooth linen' < *UH-l·. Following Schrijver, we may assume that levis is an old w-stem adj. From a preform PIE *lehii-u-, we can explain the result *leju- » *leiw-i- > levis by normal syllabification rules. Most of the other connections within … — [de Vaan, s.v. levor, p. 351]