yester-

The story

1. Proto-Indo-European · inherited from*dʰǵʰyés“yesterday”
2. Proto-Germanic · derived from*gesteraz“yesterday”
3. Proto-West Germanic · inherited from*gesteran
4. Old English · inherited fromġeostran-
5. Middle English · inherited fromyester-
6. English todayyester-

From Middle English yester-, yister-, from Old English ġeostran-, ġiestran- (“previous day, prior day”), from Proto-West Germanic *gesteran, from Proto-Germanic *gesteraz (“yesterday”), from Proto-Indo-European *dʰǵʰyés (“yesterday”). Compare Dutch gisteren, German gestern (“yesterday”), Gothic 𐌲𐌹𐍃𐍄𐍂𐌰𐌳𐌰𐌲𐌹𐍃 (gistradagis, “tomorrow”), Latin hesternus (“of yesterday”), Ancient Greek χθές (khthés, “yesterday”), Sanskrit ह्यस् (hyás, “yesterday”). More at yesterday.