From Japanese-English FreeDict Dictionary ver. 0.1: 釦 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 鈕 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, () [gai1] [ichi1] ボタン /bˈo̞täɴ/, ぼたん /bˈo̞täɴ/ (noun (common) (futsuumeishi)) Note: word usually written using kana alone (kanji is only used for push-buttons) botãobutton
釦 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, 鈕 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, () [gai1] [ichi1] ボタン /bˈo̞täɴ/, ぼたん /bˈo̞täɴ/ (noun (common) (futsuumeishi))
Note: word usually written using kana alone (kanji is only used for push-buttons) botãobutton