Definition from Wiktionary, the free dictionary
- The words sumu, usva and utu all describe "water vapor lightly suspended near the ground", but at different degrees. However, they may often be used synonymously with no discretion.
- Utu describes very light vapor near the ground, especially that occurring in the morning and therefore it is translated usually as mist or haze.
- Usva describes a bit thicker vapor than utu near the ground, especially when considering the water travelling conditions. Therefore, it is translated usually as mist, haze or fog.
- Sumu describes very thick vapor obscuring the visibility near the ground and thus, it is translated usually as mist or fog.
Declension of usva (type koira)
- sumu (see the usage notes)