pellucidness

Etymology tree
Proto-Indo-European *per-
Proto-Italic *per
Latin per
Latin lūcidus
Latin pellūciduslbor.
English pellucid
Proto-Germanic *-inōną
Proto-Indo-European *-dyé-
Proto-Germanic *-atjaną
Proto-Indo-European *-tus
Proto-Germanic *-þuz
Proto-Germanic *-assuz
Proto-Germanic *-inassuz
Proto-West Germanic *-nassī
Old English -nes
Middle English -nesse
English -ness
English pellucidness
From pellucid + -ness.