Source : Webster's Revised Unabridged Dictionary (1913)

Limpid \Lim"pid\ (-p[i^]d), a. [L. limpidus; akin to Gr.
   la`mpein to shine: cf. F. limpide. Cf. {Lamp}.]
   Characterized by clearness or transparency; clear; as, a
   limpid stream.

         Springs which were clear, fresh, and limpid.
                                                  --Woodward.

   Syn: Clear; transparent; pellucid; lucid; pure; crystal;
        translucent; bright.

Source : WordNet®

limpid
     adj 1: clear and bright; "the liquid air of a spring morning";
            "eyes shining with a liquid luster"; "limpid blue
            eyes" [syn: {liquid}]
     2: 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 cristal" [syn: {crystalline}, {crystal clear},
         {lucid}, {pellucid}, {transparent}]
     3: (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" [syn:
         {lucid}, {luculent}, {pellucid}, {crystal clear}, {perspicuous}]