Synonyms for Pellucid (same or very similar meaning)
WordNet sense 1 (transmitting light; able to be seen through with clarity):
crystalline, limpid, lucid, transparent, crystal clearWordNet sense 2 (free from cloudiness; allowing light to pass through):
clearWordNet sense 3 ((of language) transparently clear; easily understandable):
luculent, perspicuousFrom the ODE community, based on WordNetadd/edit