ringtone; melodic ringtone
Abbreviation of 着信メロディー. Refers to a melody that plays for incoming calls on a mobile phone. Common in everyday speech.
See also: 着信メロディ (ちゃくしんメロディー)
I downloaded a new ringtone.
His ringtone is an anime song.
Abbreviation of 着信メロディー (chakushin merodī, 'incoming call melody'). The first two morae of each component are combined: 着信 (chakushin) → 着 (chaku) and メロディー (merodī) → メロ (mero).