isthmus

Listen:
UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈɪsməs/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈɪsməs/ ,USA pronunciation: respelling(isməs)

Inflections of 'isthmus' (nnoun: Refers to person, place, thing, quality, etc.):
isthmuses
nplplural noun: Noun always used in plural form--for example, "jeans," "scissors."
isthmi
nplplural noun: Noun always used in plural form--for example, "jeans," "scissors."

WordReference Random House Learner's Dictionary of American English © 2020
isth•mus /ˈɪsməs/USA pronunciation   n.[countable]pl.  -mus•es, -mi /-maɪ/.USA pronunciation  
  1. a narrow strip of land, bordered on both sides by water, connecting two larger bodies of land:The isthmus of Panama is between North and South America.

WordReference Random House Unabridged Dictionary of American English © 2020
isth•mus  (isməs),USA pronunciation n., pl.  -mus•es, -mi (isməs),USA pronunciation 
  1. a narrow strip of land, bordered on both sides by water, connecting two larger bodies of land.
  2. Anatomy, Zoologya connecting, usually narrow, part, organ, or passage, esp. when joining structures or cavities larger than itself.
  3. Fish[Ichthyol.]the narrow fleshy area between the sides of the lower jaw of a fish.
isthmoid, adj. 
  • Greek isthmós neck (of land)
  • Latin
  • 1545–55

Collins Concise English Dictionary © HarperCollins Publishers::
isthmus /ˈɪsməs/ n ( pl -muses, -mi / -maɪ/)
  1. a narrow strip of land connecting two relatively large land areas
  2. a narrow band of tissue connecting two larger parts of a structure
  3. a narrow passage connecting two cavities
Etymology: 16th Century: from Latin, from Greek isthmos

ˈisthmoid adj
'isthmus' also found in these entries:
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