An archaic or dialectal spelling of 'haze' or a variant term for a small enclosure or fenced area (haw).
Possibly from Middle English 'haw' (hedge/enclosure) with dialectal 'z' ending, or an obsolete spelling of 'haze'; regional English variation.
Old English spelling variants like 'hayz' show how fluid writing was before standardization in the 1800s—the same word could be spelled five different ways and everyone understood!
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