pijavica

1. leech
   Posle kupanja u bari imao sam pijavicu na nozi. — After swimming in the pond I had a leech on my leg.
2. derog. (of a person) leech; bloodsucker; parasite
   Taj tvoj rođak je obična pijavica. — That cousin of yours is just a leech.
3. (of weather) waterspout; tornado
   Iznad jezera se juče pojavila vodena pijavica. — A waterspout appeared over the lake yesterday.

In the weather sense it often appears as vodena pijavica.