pellucidity

The same analogy may be used to explain the whiteness of the hair of old people, which loses its pellucidity along with its moisture.

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.

The style, however, was pithy, and in writing that is the first Christian grace—no, I forgot, it is the second; pellucidity is the first.

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.