yestern adjective 1adverb 1noun 1forms 1 adjective1 •(no longer used, rare) Of or pertaining to yesterday.Argos, I fear, will pay us soon again Her yestern debt[…] — 1868 adverb1 •(no longer used) Yesterday."F. Newman's book I saw yestern at our ouse," Arnold writes to Clough. "He seems to have written himself down an hass. — 1949 noun1 •(no longer used) Yesterday.Yestern was the day of hail, […] — 1839 formsyesterns
