definition of
lucid

[1] #1 lucid s. [limpid, luculent, pellucid, crystal clear, perspicuous] (of language) transparently clear; easily understandable; "writes in a limpid style"; "lucid directions"; "a luculent oration"- Robert Burton; "pellucid prose"; "a crystal clear explanation"; "a perspicuous argument". wn

[2] #2 lucid s. having a clear mind; "a lucid moment in his madness". wn

[3] #3 lucid s. [crystalline, crystal clear, limpid, pellucid, transparent] transmitting light; able to be seen through with clarity; "the cold crystalline water of melted snow"; "crystal clear skies"; "could see the sand on the bottom of the limpid pool"; "lucid air"; "a pellucid brook"; "transparent crystal". wn