1. limpidus — de Vaan
limpidus 'clear, transparent' [adj\ o/a] (Cat+) Derivatives: limpor [m.] 'a clear liquid' (LuciL). Since limpor is attested earlier than limpidus, the latter may well have been derived from the former by a productive pattern» According to Solta 1967, who follows an earlier idea by Emout, limpidus may be a dialectal (Sabellic) form in Latin, derived from a verb *limp-e- 'to be liquid' < *li-n-l?-e- (which Solta … — [de Vaan, s.v. limpidus, p. 356]