| 单词 | contraceptive | ||||||
| 释义 | contraceptivecon·tra·cep·tiveC0605200 (kŏn′trə-sĕp′tĭv)contraceptive(ˌkɒntrəˈsɛptɪv)con•tra•cep•tive(ˌkɒn trəˈsɛp tɪv)adj. con·tra·cep·tive(kŏn′trə-sĕp′tĭv)
contraception(kontrəˈsepʃən) nouncontraceptive→ 避孕品zhCNContraceptivecontraceptive[¦kän·trə¦sep·tiv]Contraceptiveone of various mechanical, biological, chemical, and surgical agents and methods used to prevent pregnancy and one of the most common forms of contraception. Mechanical contraceptives principally prevent spermatozoa from penetrating into the uterus; they include female contraceptive devices that are inserted into the cervix and uterine cavity and male condoms. Chemical contraceptives act on spermatozoa that have entered the vagina by immobilizing them and depriving them of their fertilizing capacity. Some scientists regard synthetic preparations that have a general resorptive effect on the body to be chemical contraceptives. It is more accurate, however, to regard them as biological contraceptives. Agents of chemical contraception used locally include globules, suppositories, pastes, creams, tablets, and foams. They contain acids, quinine, and tannin and a contraceptive base. Combination contraceptives unite both chemical methods that are used locally and mechanical methods; they include chemical (melting) caps, sponges, tampons saturated with spermicides, and douches that spray the vagina with spermicides. Biological contraceptives act on various parts of the reproductive process, for example, on the movement of sex cells through the reproductive system, on fertilization, and on the implantation of a fertilized ovum in the uterus. Biological contraceptives include highly active synthetic hormonal preparations for oral administration and certain biologically active nonhormonal agents, such as antihyaluronidases and antihistamines. The effectiveness of biologically active nonhormonal agents has not yet been sufficiently proved. Oral and intrauterine contraceptives are widespread. Oral contraceptives have various mechanisms of action. The majority of highly active synthetic hormonal preparations must be taken daily for 21 days starting on the fifth day of the menstrual cycle in order to be almost 100 percent effective. Oral contraceptives have been developed that are effective when taken after presumed fertilization. In many women these contraceptives may produce bloody discharge, vomiting, and nausea. These reactions, however, are usually temporary and do not necessitate discontinuing the preparations. Oral contraceptives must be used only under a physician’s supervision. It is not recommended that they be used for more than six months consecutively because of possible complications. Intrauterine contraceptives come in various sizes and shapes, for instance, rings, loops, and spirals. They are made of various materials, such as stainless steel and polymers. Insertion is into the uterine cavity, where the contraceptive is left as long as one year. The mechanism of intrauterine contraceptives is not sufficiently clear. Menstrual cycle irregularities, pain, and inflammatory diseases sometimes occur with their use. Prolonged use of any contraceptive is detrimental to health, and it is necessary to change the contraceptive periodically. V. I. ALIPOV contraceptivecontraceptive[kon″trah-sep´tiv]con·tra·cep·tive(kon'tră-sep'tiv),contraceptive(kŏn′trə-sĕp′tĭv)contraceptiveadjective Relating to contraception.noun Any device or method for preventing fertilisation. Types Barrier methods (condoms, diaphragms), hormone combinations, spermicides, implantable hormonal devices, RU-486 and others. contraceptiveObstetrics adjective Relating to contraception noun Any device or method for preventing fertilization, or a term product of conception Types Barrier methods–condoms, diaphragms, hormone combinations, spermicides, implantable hormonal devices, RU-486, etc. See Contraception, Dalkon shield, IUD, 'Litogen. ', Lunelle, Mirena, Nuvaring, Oral contraceptive, Ortho Evra, Pearl index, RU-486, Seasonale, Sequential oral contraceptive, Wrongful birth.con·tra·cep·tive(kon'tră-sep'tiv)contraceptivesee BIRTH CONTROL.Patient discussion about contraceptiveQ. Does it exist a Birth Control Shot for men? Q. BIRTH CONTROL how many types are there? Q. how long after i have stop taking birth control pills can i get pregnant? contraceptive
Synonyms for contraceptive
|
||||||
| 随便看 |
|
英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。
contraceptive - an agent or device intended to prevent conception
contraceptive - capable of preventing conception or impregnation; "contraceptive devices and medications"