Yester a. : Last; last past; next before; of or pertaining to yesterday.

Example:
Why was my hamster just fine Yester day and not acting funny but today he is dead?

Taxonomy
yester, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, Google Search, Custom Search, glossary, english, language, ESL, Search, adjective, Unabridged Dictionary, Open Dictionary, Pronunciation Symbols.

Defination from the web:
yester from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "yester" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this page: Products ...