chorion

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈkɔːrɪən/US:USA pronunciation: respellingUSA pronunciation: respelling(kôr′ē on′, kōr′-)


WordReference Random House Unabridged Dictionary of American English © 2026
cho•ri•on  (kôr′ē on′, kōr′-),USA pronunciation n. 
  1. Developmental Biology[Embryol.]the outermost of the extraembryonic membranes of land vertebrates, contributing to the formation of the placenta in the placental mammals.
  2. [Zool.]the membrane around the eggs of certain insects, secreted by cells of the ovary.
  • Greek chórion membrane enclosing the fetus
  • Neo-Latin
  • 1535–45
cho′ri•on′ic, cho′ri•al, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
chorion /ˈkɔːrɪən/ n
  1. the outer of two membranes that form a sac around the embryonic reptile, bird, or mammal: contributes to the placenta in mammals
    See also amnion
Etymology: 16th Century: from Greek khorion afterbirthˌchoriˈonic, ˈchorial adj
'chorion' also found in these entries (note: many are not synonyms or translations):
allantois - amnion - choroid - chorio- - chorioallantois - chorionic gonadotropin - chorionic villus - chorionic villus sampling - extraembryonic membrane - human chorionic gonadotropin - serosa - subchorionic

Forum discussions with the word(s) "chorion" in the title:


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