UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈlʌndənˌdɛrɪ/US:USA pronunciation: respellingUSA pronunciation: respelling(lundən der′ē)

WordReference Random House Unabridged Dictionary of American English © 2020
Lon•don•der•ry  (lundən der′ē),USA pronunciation n. 
  1. Place Namesa county in N Northern Ireland. 130,889;
    804 sq. mi. (2082 sq. km).
  2. Place Namesits county seat: a seaport. 54,000.
  3. Place Namesa town in SE New Hampshire. 13,598. Also called  Derry (for defs. 1, 2).

Collins Concise English Dictionary © HarperCollins Publishers::
Londonderry /ˈlʌndənˌdɛrɪ/ n
  1. a historical county of NW Northern Ireland, on the Atlantic: in 1973 replaced for administrative purposes by the districts of Coleraine, Derry, Limavady, and Magherafelt. Area: 2108 sq km (814 sq miles)
  2. a port in N Northern Ireland, second city of Northern Ireland: given to the City of London in 1613 to be colonized by Londoners; besieged by James II's forces (1688–89). Pop: 83 699 (2001)

See also Derry
'Londonderry' also found in these entries:

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