Plural of cobnut; multiple large cultivated hazelnuts with thick shells.
From the singular 'cobnut,' which derives from 'cob' (rounded) plus 'nut.' The term became standardized for the specific cultivated variety in English agriculture.
Cobnuts are so specifically British that they have their own harvest season and are still judged in agricultural competitions—the UK even has an official 'Cobnut Day' to celebrate them.
Complete word intelligence in one call. Free tier — 50 lookups/day.