Donegal2Pronunciation: /ˌdɒnɪˈgɔːl, ˌdʌnɪ-, ˈdɒnɪgɔːl, ˈdʌnɪ-/ (also Donegal tweed)Definition of Donegal noun [mass noun] a tweed characterized by bright flecks randomly distributed on a background that is typically light grey, as originally woven in County Donegal. Donegal in other Oxford dictionaries Definition of Donegal in the US English dictionary