chorion

1. 1.

   the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)

   Broadersac

   Part ofamniotefetal membrane

   Partschorionic villus

   mammal

Other forms of chorion

plural

chorions·

Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.

Questions about chorion

What does chorion mean?

chorion means "the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)".

How many syllables are in chorion?

chorion has 3 syllables: cho-ri-on. The stress falls on "cho".

Is chorion a common word?

chorion is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.