Chorion

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Chorion \Cho"ri*on\, n. [NL., fr. Gr. ?.]
     1. (Anat.)
        (a) The outer membrane which invests the fetus in the
            womb; also, the similar membrane investing many ova at
            certain stages of development.
        (b) The true skin, or cutis.


            [1913 Webster]
  
     2. (Bot.) The outer membrane of seeds of plants.
        [1913 Webster]

From WordNet (r) 2.0 [wn]:

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