English
altostratus
From alto- + stratus.
Proto-Indo-European *sterh₃- ‘to spread, extend, stretch out’
Proto-Indo-European *str̥h₃tós ‘stretched, spread’
Proto-Italic *strātos
Latin stratus ‘spread or stretched out’
English stratus
Today it means
noun A principal medium-level cloud type in the form of a gray or bluish (never white) sheet or layer of striated, fibrous, or uniform appearance.
Language periods are conventional ranges, not dates for this word.
Etymograph / altostratus