chorionicadj.
/kɔːrɪˈɒnɪk/ Embryology.
Of or relating to the chorion.
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the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > membranes, etc., of embryo or fetus > [adjective] > membranes enclosing
allantoid1730
amniotic1822
cotyledonal1850
amnic1855
allantoidean1857
chorial1879
cotyledonary1888
chorionic1892
allantoica1933
intra-amniotic1960
1892 E. L. Mark tr. O. Hertwig Text-bk. Embryol. 261 The double-layered chorionic epithelium is already distinctly present in eggs four weeks old.
1902 D. J. Cunningham Text-bk. Anat. 23 The placental area.., together with the blastoderm over the rest of the ovum, forms the chorionic area.
1902 D. J. Cunningham Text-bk. Anat. 50 The chorionic villi.
1912 J. S. Huxley Individual in Animal Kingdom iii. 68 The armadillo's hood, like the identical twins in man, has a single chorionic membrane.
1964 L. C. Martin Clin. Endocrinol. (ed. 4) i. 9 Large amounts of chorionic gonadotrophins are present in the urine of patients with chorionepithelioma.
Draft additions June 2003
chorionic gonadotropin n. (also chorionic gonadotrophin) Physiology a glycoprotein hormone related in structure and function to the pituitary gonadotropins (luteinizing hormone and follicle stimulating hormone), which is produced by the placenta, chiefly in humans, other primates, and equids, and promotes continued hormone secretion by the corpus luteum, enabling the early stages of pregnancy to be maintained; spec. the human form of this hormone; (also) a pharmaceutical preparation of this hormone.
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1935 H. M. Evans in Jrnl. Amer. Med. Assoc. 9 Feb. 466/2 For all these reasons it would seem best to designate this substance as chorionic gonadotropic hormone. [Note] Or chorionic gonadotropin.
1940 Science 7 June 555/2 Similar treatment with estradiol dipropionate and testosterone propionate in combination with chorionic gonadotropin failed to give the ovarian development secured with diethylstilboestrol.
1973 N. Freedman Joshua 40 The night before the laparotomy he administered an injection of chorionic gonadotropin.
1993 Q. Rev. Biol. 68 509/1 Chorionic gonadotropins of equids and primates may initially have evolved because they caused a shift in power towards offspring.
1996 J. Hegland Into Forest (1997) 162 In addition to the physician's tests for raised levels of chorionic gonadotropin, pregnancy is first recognized by the symptoms of nausea, swollen breasts, and missed menstrual periods.
This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2018).
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adj.1892