A small restaurant or dining establishment; an archaic or dialect term for a place where dinners are served.
From dinner + -ery suffix (place where something is done). A now-obsolete or rare term from older English for a casual eating establishment.
The word 'dinnery' is a fossil from an earlier era of English when you'd encounter dozens of such -ery and -ory words for workplaces and establishments; most have died out except in fossilized phrases, making dinnery a linguistic time capsule.
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