UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈkɑːsəlˌreɪ/US:USA pronunciation: respellingUSA pronunciation: respelling(kasəl rā′, käsəl-)

WordReference Random House Unabridged Dictionary of American English © 2020
Cas•tle•reagh  (kasəl rā′, käsəl-),USA pronunciation n. 
  • BiographicalRobert Stewart, Viscount  (2nd Marquess of Londonderry), 1769–1822, British statesman.

  • Collins Concise English Dictionary © HarperCollins Publishers::
    Castlereagh /ˈkɑːsəlˌreɪ/ n
    1. a district of E Northern Ireland, in Co Down. Pop: 66 076 (2003 est). Area.: 85 sq km (33 sq miles)
    Castlereagh /ˈkɑːsəlˌreɪ/ n
    1. Viscount. title of Robert Stewart, Marquis of Londonderry. 1769–1822, British statesman: as foreign secretary (1812–22) led the Grand Alliance against Napoleon and attended the Congress of Vienna (1815)
    'Castlereagh' also found in these entries (note: many are not synonyms or translations):

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