/ ˈgrəʊsə(r); NAmE ˈgroʊ-/ noun
1.
a person who owns, manages or works in a shop / store selling food and other things used in the home
2.
gro·cer's ( pl. gro·cers ) a shop / store that sells these things
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WORD ORIGIN
Middle English (originally a person who sold things in the gross (i.e. in large quantities)): from Old French grossier , from medieval Latin grossarius , from late Latin grossus gross.