Noun
spissatus (plural spissati)
(meteorology) A cloud species which consists of dense, high level strands, which can haze, or block the sun. Associated only with cirrus formations.
Cirrus spissatus appear as opaque patches that can show light grey shading. Source: Internet
Opacity-based Varieties Cirrus clouds are translucent and so have no opacity-based varieties; only one species is opaque, which is cirrus spissatus. Source: Internet