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trophosphere
trophosphere n. 
/ˈtrəʊfə(ʊ)sfɪə/, /ˈtroʊfəˌsfɪ(ə)r/ now rare a spherical structure or layer of tissue formed in the early stages of implantation of the blastocyst.
Brit. /ˈtrɒfə(ʊ)sfɪə/
, /ˈtrɒfə(ʊ)sfɪə//ˈtrəʊfə(ʊ)sfɪə/U.S. /ˈtrɑfəˌsfɪ(ə)r/
, /ˈtrɑfəˌsfɪ(ə)r//ˈtroʊfəˌsfɪ(ə)r/ΘΚΠ
the world > animals > mammals > [noun] > parts of > placenta and related parts
glean1601
placenta1638
subplacenta1807
trophocalyx1889
trophodisc1889
trophosphere1889
trophospongia1889
1889 A. A. W. Hubrecht in Q. Jrnl. Microsc. Sci. 30 322 These two [sc. the trophoblast and the trophospongia] together, forming in Erinaceus a sphere which is shut off from the uterus lumen by the fusion of the lips of the decidua reflexa, should be indicated by the name of trophosphere.
1908 T. W. Eden Man. Midwifery (ed. 2) i. 17 The blood filled vacuoles of the trophosphere are the earliest representatives of the intervillous spaces of the mature placenta.
1995 Placenta 16 655 TE1 cells also contain structures similar to those present in cells of the outer layer of trophospheres.
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as lemmas