nudiustertian UK /n(j)ʊdi.əsˈtɜʃɪən/US /nudiəsˈtɜɹʃən/ adjective1 •(no longer used, rare) Of or relating to the day before yesterday; very recent.One of the best Chocolate gateau^([sic – meaning gateaux]) I have ever had! And I just had it nudiustertian afternoon. — 2015