layer cloud One of the principal forms of cloud, with flattened, sheet-like appearance and of limited vertical extent. Common types of cloud exhibiting this form are: (a) low-level layer clouds, e.g. fog and stratus; and (b) multi-layered clouds, e.g. altostratus, cirrostratus, and nimbostratus. See also CLOUD CLASSIFICATION.

layer cloud One of the principal forms of cloud, with flattened, sheet-like appearance and of limited vertical extent. Common types of cloud exhibiting this form are: (a)low-level layer clouds (e.g. fog and stratus); and(b)multi-layered clouds (e.g. altostratus, cirrostratus, and nimbostratus).See also cloud classification.