sumu

Sumu is a Finnish noun meaning fog or mist. It refers to the atmospheric condition in which low-lying clouds reduce visibility. In everyday speech and in literature, sumu is used to describe hazy environments, and the related adjective sumuinen means foggy (for example, sumuinen aamu, foggy morning).

Etymology and usage: Sumu comes from Proto-Finnic roots and is part of a Finnic word-family for weather phenomena. It is a common noun in modern Finnish.

Other uses: As a proper noun, sumu appears rarely in personal or place names, but such uses are uncommon; the term is primarily lexical.

See also: fog, mist, Finnish language.