| 释义 |
chorionic, a. Embryol.|kɔərɪˈɒnɪk|
[See -ic.]
Of or relating to the chorion.
1892E. L. Mark tr. Hertwig's Embryol. 261 The double-layered chorionic epithelium is already distinctly present in eggs four weeks old. 1902D. J. Cunningham Anat. 23 The placental area.., together with the blastoderm over the rest of the ovum, forms the chorionic area. Ibid. 50 The chorionic villi. 1912J. S. Huxley Individ. in Animal Kingdom iii. 68 The armadillo's hood, like the identical twins in man, has a single chorionic membrane. 1964[see chorion].
▸ chorionic gonadotropin n. (also chorionic gonadotrophin) Physiol. 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.
1935H. 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. 1940Science 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. 1973N. Freedman Joshua 40 The night before the laparotomy he administered an injection of chorionic gonadotropin. 1993Q. Rev. Biol. 68 509/1 Chorionic gonadotropins of equids and primates may initially have evolved because they caused a shift in power towards offspring. 1996J. 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. |