Definition of oast
: a usually conical kiln used for drying hops, malt, or tobacco —called also oast*house, \-ˌhau̇s\
Origin and Etymology of oast
Middle English ost, from Old English āst; akin to Middle Dutch eest kiln, Latin aestus heat, aestas summer — more at edify
First Known Use: before 12th century
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