Adjective : pellucid waters. ,a pellucid way of writing.    From Dictionary.com. 

I'd even managed to stop it translating what the occasional patronizing mugull would ask me every time I stopped to gape at some extraordinary sight, as "Is one's discombobulation requiring pellucidity?".    From Wordnik.com.  [Asimov's Science Fiction]

The same analogy may be used to explain the whiteness of the hair of old people, which loses its pellucidity along with its moisture.    From Wordnik.com.  [Zoonomia, Vol. II Or, the Laws of Organic Life] Reference

And the other the post-remote effect; as the renewed pellucidity of the cornea; and thus six links of causation may be expressed in words.    From Wordnik.com.  [Zoonomia, Vol. II Or, the Laws of Organic Life] Reference

The red colour is owing to the pellucidity of the newly formed vessels, and as the arterial parts of them are probably formed before their correspondent venous parts.    From Wordnik.com.  [Zoonomia, Vol. I Or, the Laws of Organic Life] Reference

If neurotic blindness, morbid loathing, and ferocious adherence to an idea are the symptoms of intellectual swamp fever, common sense and disinterested pellucidity are the marks of a healthy intelligence.    From Wordnik.com.  [Claremont.org] Reference

The Hydrocele is known by a tumor of the scrotum, which is without pain, gradually produced, with fluctuation, and a degree of pellucidity, when a candle is held behind it; it is the most simple incysted dropsy, as it is not in general complicated with other diseases, as ascites with schirrous liver, and hydrocephalus internus, with general debility.    From Wordnik.com.  [Zoonomia, Vol. II Or, the Laws of Organic Life] Reference

In all the syncopes, which I have seen induced after convulsive fits, the pulse has continued natural, though the organs of sense, as well as the locomotive muscles, have ceased to perform their functions; for it is necessary for the perception of objects, that the external organs of sense should be properly excited by the voluntary power, as the eye-lids must be open, and perhaps the muscles of the eye put into action to distend, and thence give greater pellucidity to the cornea, which in syncope, as in death, appears flat and less transparent.    From Wordnik.com.  [Zoonomia, Vol. I Or, the Laws of Organic Life] Reference