noun. a stratus cloud at an intermediate altitude of 2 or 3 miles.
- stratus cloud
- altostratus cloud
Example sentences of the word altostratus
1. Noun, singular or mass
Such cold-front cumuli often pile up right along the frontal boundary on comparatively short notice, whereas the cirrus, cirrostratus, altostratus, stratus and nimbostratus of a warm front often are clouds that cover a large area.
Mid-level clouds are designated with a prefix of “alto-” and include altocumulus and altostratus clouds.