Aquilonimbus 

Aquilonimbus combines "aqui" (Latin for water) and "nimbus" (Latin for rainstorm). It represents a powerful and intense rainstorm with heavy precipitation and gusty winds. (This word is a noun)

The storm clouds gathered ominously, heralding the approach of an Aquilonimbus that would drench the town with torrential rain and fierce winds.

Aquilonimbus by Polysemous May 16, 2023

Aquilonimbus 

Part of Speech: Noun

Definition: A rare and powerful type of thundercloud characterized by its immense size, towering vertical development, and potential to produce intense rainfall, lightning, and strong winds. Aquilonimbus clouds often form in regions where cold polar air collides with warmer air masses.

Etymology: "Aquilonimbus" is a portmanteau word formed by combining "aqui-" from "aqua" (Latin for water) and "nimbus" (a type of cloud). "Aquilo" is a Latin term for the north wind, often associated with cold and polar air. "Nimbus" refers to a type of cloud that brings precipitation. The term is constructed to reflect the cold and stormy nature of these clouds, which result from the clash between cold and warm air masses.

Term coined by Professor Justin Ho Guo Shun

The weather forecast warned of possible severe storms with aquilonimbus clouds, advising residents to take necessary precautions against lightning strikes and flash flooding.

Aquilonimbus by Justin Ho Guo Shun August 27, 2023