an ancient region in NW France, corresponding generally to Brittany.
British Dictionary definitions for Armorica
Armorica
/ɑːˈmɒrɪkə/
noun
1.
an ancient name for Brittany
Word Origin and History for Armorica
ancient name for Brittany, from Gallo-Romance Are-mor-ica, literally "before the sea," with a Celtic prefix meaning "before" (cf. Old Irish ar) + mare "sea" (see mere (n.)).