Where Does the Word Yesterday Come from?

Yesterday is first seen as a single word in a document from about 1250 CE, being spelled as yisterdai. It was formed from the Old English compound noun geostran dæg 'yesterday day' (c. 950), with geostran being first recorded on its own around 725.

What does yester mean in yesterday?

archaic. : of or relating to yesterday.

What does Yesyter mean?

yester- a combining form, now unproductive, occurring in words that denote an extent of time one period prior to the present period, the nature of the period being specified by the second element of the compound: yesterweek.