A berry or berry-like fruit associated with corn plants or a regional name for a specific wild berry found in corn-growing areas.
Compound of corn + berry, likely a folk designation for a plant found among corn crops or a dialectal name from corn-growing regions.
Folk taxonomy is fascinating—plants often got common names based on where people found them ('corn' + whatever they grew near), meaning 'cornberry' tells us more about human geography than actual plant relationships!
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