fumulus

Etymology

Blend of fume + cumulus.

fumulus means A very thin cloud resembling a veil, especially one formed of water droplets from a rising plume (from a cooling tower etc). Lexicurio rates it Sui generis — a strength score of 88 out of 100.

noun

A very thin cloud resembling a veil, especially one formed of water droplets from a rising plume (from a cooling tower etc)