Definition

1. Noun (Meteorology):
   • Thundercloud / Cumulonimbus cloud: A large, dense, and vertically developed type of cloud associated with thunderstorms, heavy precipitation, lightning, and sometimes hail. It is the mature stage of a thunderstorm cell.
   • Storm cloud: A general term for dark, threatening clouds that indicate an approaching storm.

Usage Examples

• Noun:
  • Bầu trời đen kịt vì những đám mây dông. (The sky is dark with thunderclouds.)
  • Mây dông thường mang theo mưa lớn và sấm chớp. (Storm clouds often bring heavy rain and thunder and lightning.)
  • Phi công cố gắng lái máy bay tránh vùng có mây dông. (The pilot tried to steer the plane away from the cumulonimbus cloud area.)

Advanced Usage

• In meteorological contexts, "mây dông" specifically refers to cumulonimbus (Cb), the cloud genus known for severe weather.
  • Dự báo thời tiết cảnh báo về sự hình thành của mây dông trên biển. (The weather forecast warns of cumulonimbus formation over the sea.)

Variants and Related Words

• Mây vũ tích (n): An older or more technical Vietnamese term for cumulonimbus, directly translating to "rain heap cloud."
• Mây giông (n): A variant spelling/synonym for "mây dông."

Synonyms

• Thundercloud
• Cumulonimbus cloud (technical)
• Storm cloud

Related Idioms and Phrases

• Đen như mây dông: As dark as a storm cloud; used to describe something very dark or a grim situation.
  • Khuôn mặt ông ấy đen như mây dông. (His face was as dark as a thundercloud.)
• Mang theo mây dông: To bring storm clouds; metaphorically, to bring trouble or a bad atmosphere.
  • Sự có mặt của anh ta như mang theo mây dông vào cuộc họp. (His presence was like bringing storm clouds into the meeting.)