Russian

Prefix

трёх- • ‎(trjox-)

1. tri-, triple (three)

   трёхсторо́нний‎ ― trjoxstorónnij ― trilateral

   трёхстру́нный‎ ― trjoxstrúnnyj ― three-stringed

   трёхколёсный‎ ― trjoxkoljósnyj ― three-wheeled

   трёхнеде́льный‎ ― trjoxnedélʹnyj ― three-week

   трёхлине́йка‎ ― trjoxkoljósnyj ― three-line rifle (Mosin-Nagant)

Usage notes

The letter ё ‎(jo) in трёх- ‎(trjox-), which naturally carries the primary stress, instead carries the secondary stress as a rare exception. The letter ё ‎(jo) becomes е ‎(je) in fast or casual speech. See четырёх- ‎(četyrjox-) for another example.