What does Altostratus cloud mean?

Altostratus cloud meaning in General Dictionary

a stratus cloud at an intermediate altitude of 2 or 3 kilometers

Altostratus cloud meaning in Symbols Dictionary

Altostratus is a middle altitude cloud genus from the stratiform actual group characterized by a generally consistent grey to bluish-gray sheet or level, lighter in shade than nimbostratus and darker than high cirrostratus.