chori-

American  

1. variant of chorio-.

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Usage

What does chori- mean? Chori- is a combining form used like a prefix meaning either “chorion” or "choroid." It is used in a few scientific terms, especially in anatomy and biology. The chorion is the outermost membrane surrounding the embryo of a reptile, bird, or a mammal, and which contributes to the formation of the placenta in mammals, including humans. Choroid means “like the chorion,” but it can also refer to the choroid coat, the vascular layer of the eye. Chori- comes from the Greek chórion, meaning “the outer membrane of the fetus.”Chori- is a variant of chorio-, which loses its -o- when combined with words or word elements beginning with vowels. Want to know more? Read our Words That Use chorio- article. Related to chori- are the combining forms choroido- and chorioido-, specifically used to represent the choroid coat.