[al.to.stra.tus] n, pl -ti [NL, fr. L altus + NL -o- + stratus] (1894): a cloud formation similar to cirrostratus but darker and at a lower level--see cloud illustration
ALTOSTRATUS
Meaning of ALTOSTRATUS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012