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exochorion
exochorion n. 
/ˌɛksə(ʊ)ˈkɔːrɪɒn/, /ˌɛksoʊˈkɔriˌɑn/ Anatomy the outer layer of the chorion or membrane that encloses the fœtus. [After French exochorion (1826 or earlier).]
Brit. /ˌɛksə(ʊ)ˈkɔːrɪən/
, /ˌɛksə(ʊ)ˈkɔːrɪən//ˌɛksə(ʊ)ˈkɔːrɪɒn/U.S. /ˌɛksəˈkɔriˌɑn/
, /ˌɛksəˈkɔriˌɑn//ˌɛksoʊˈkɔriˌɑn/ΚΠ
1850 R. P. Thomas tr. P. Cazeaux Theoret. & Pract. Treat. Midwifery 185 It consists of two laminæ, the external or primitive of which, also called the exochorion, is wholly deprived of vessels.
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