UNICYCLE
Meaning of UNICYCLE in English
u ‧ ni ‧ cy ‧ cle /ˈjuːniˌsaɪk ə l/ BrE AmE noun [countable]
a vehicle that is like a bicycle but has only one wheel
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012