1. Plural of altostratus; a type of mid-level cloud formation that appears as a uniform, grayish-white sheet or layer, often partially obscuring the sun.
Usage: meteorology; plural form

Examples

• The meteorologist identified altostrati clouds at about 6,500 feet above the ground.
• On overcast days, altostrati often cover the entire sky in a thin, uniform blanket.
• Pilots must be aware of altostrati formations when planning flight routes.
• The sun was barely visible through the layer of altostrati clouds.
• Weather forecasters use satellite imagery to track altostrati patterns across regions.