perlucidus

perlucidus

[pər′lü·səd·əs]
(meteorology)
A cloud variety, usually of the species stratiformis, in which distinct spaces between its elements permit the sun, moon, blue sky, or higher clouds to be seen.
References in periodicals archive ?
5) There is, however, an interesting twist to this, as Freia's doctoral project in meteorology is an encyclopedia of cloud types, the rarest and most transparent of which, Cirrus Perlucidus, she finds only at the end of the book, when her mother shares with her the rest of the story about her family's escape from the collapsing eastern front.
10) One should note, however, that Paul hopes throughout the novel to put the past to rest, to be able to move away from it--much as Freia hopes to capture, at least photographically, full transparency in her search for Cirrus Perlucidus (318).
COINCIDENT SUN PILLAR AND PERLUCIDUS CLOUD OPTICS UNDER THE MIDNIGHT SUN, ANCHORAGE, AK.