UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɡɒlˈkɒndə/US:USA pronunciation: respellingUSA pronunciation: respelling(gol kondə)

WordReference Random House Unabridged Dictionary of American English © 2020
Gol•con•da  (gol kondə),USA pronunciation n. 
  1. Place Namesa ruined city in S India, near the modern city of Hyderabad: capital of a former Muslim kingdom;
    famous for its diamond cutting.
  2. (often l.c.) a rich mine or other source of great wealth.

Collins Concise English Dictionary © HarperCollins Publishers::
Golconda /ɡɒlˈkɒndə/ n
  1. a ruined town and fortress in S central India, in W Andhra Pradesh near Hyderabad city: capital of one of the five Muslim kingdoms of the Deccan from 1512 to 1687, then annexed to the Mogul empire; renowned for its diamonds
  2. (sometimes not capital) a source of wealth or riches, esp a mine
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