From Wiktionary, the free dictionary
From tras- + ante- (“before”) + ontem (“yesterday”).
- (Brazil) IPA(key): /ˌtɾa(j)zˌɐ̃.t͡ʃiˈõ.tẽj̃/ [ˌtɾa(ɪ̯)zˌɐ̃.t͡ʃiˈõ.tẽɪ̯̃], /tɾa.zɐ̃.teˈõ.tẽj̃/ [tɾa.zɐ̃.teˈõ.tẽɪ̯̃]
- (Brazil) IPA(key): /ˌtɾa(j)zˌɐ̃.t͡ʃiˈõ.tẽj̃/ [ˌtɾa(ɪ̯)zˌɐ̃.t͡ʃiˈõ.tẽɪ̯̃], /tɾa.zɐ̃.teˈõ.tẽj̃/ [tɾa.zɐ̃.teˈõ.tẽɪ̯̃]
- (Southern Brazil) IPA(key): /ˌtɾa(j)zˌɐ̃.teˈõ.tẽj̃/ [ˌtɾa(ɪ̯)zˌɐ̃.teˈõ.tẽɪ̯̃], /tɾa.zɐ̃.teˈõ.tẽj̃/ [tɾa.zɐ̃.teˈõ.tẽɪ̯̃]
Hyphenation: tras‧an‧te‧on‧tem
trasanteontem
- the day before the day before yesterday; three days before today