1. Plural of altocumulus; white or gray patches or layers of clouds occurring at medium altitude (6,500–20,000 feet), often arranged in parallel bands or rounded masses.
Usage: meteorology; plural form; commonly observed in fair weather

Examples

• The meteorologist identified altocumuli clouds forming across the sky in a distinctive wave pattern.
• Altocumuli often appear as small, white, fluffy clouds arranged in regular rows.
• When you see altocumuli at sunrise, it may indicate changing weather within the next 24 hours.
• The pilot reported altocumuli at 15,000 feet during the morning flight.
• Altocumuli clouds are thinner than cumulus clouds and allow some sunlight to pass through.