ユニサイクルMeanings1noununicycleA one-wheeled vehicle; synonymous with 一輪車 (ichirinsha), but ユニサイクル is the common katakana loanword.See also: 一輪車彼かれはユニサイクルに乗のって公こう園えんを走はしっている。He is riding a unicycle around the park.