UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈɪsθmɪən/US:USA pronunciation: respellingUSA pronunciation: respelling(ismē ən)

WordReference Random House Unabridged Dictionary of American English © 2020
isth•mi•an  (ismē ən),USA pronunciation adj. 
  1. of or pertaining to an isthmus.
  2. Place Names(cap.) of or pertaining to the Isthmus of Corinth or the Isthmus of Panama.

  1. Place Namesa native or inhabitant of an isthmus.
  • Greek ísthmios of a neck of land, equivalent. to isthm(ós) neck + -ios adjective, adjectival suffix) + -an
  • Latin isthmi(us) (
  • 1595–1605

Collins Concise English Dictionary © HarperCollins Publishers::
isthmian /ˈɪsθmɪən/ adj
  1. relating to or situated in an isthmus
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