an island and county of N Wales, formerly part of Gwynedd (1974–96), separated from the mainland by the Menai Strait. Administrative centre: Llangefni. Pop: 59 500 (2003 est). Area: 720 sq km (278 sqmiles)
Welsh name: Ynys Môn
Anglesey in American English
(ˈæŋgəlˌsi) or ˈAngleˌsea (ˈæŋgəlˌsi)
1.
former county of NW Wales, now part of Gwynedd county
2.
large island in the Irish Sea off the NW coast of Wales: part of Gwynedd county: 276 sq mi (715 sq km)