| ND | Doctor of Naturopathy; nasal deformity; natural death; Naval Dispensary; neonatal death; neoplastic ... |
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| NK | Commission on [Anatomical] Nomenclature [Ger. Nomenklatur Kommission]; natural killer [cell]; neurok... |
| NKCA | natural killer cell activity |
| NKCF | natural killer cytotoxic factor |
| NKSF | natural killer cell stimulatory factor |
natural purification (자정 작용
| abortion, legal | Termination of pregnancy under conditions allowed under local laws. (12 Dec 1998) |
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| abortion, missed | The retention in the uterus of a dead foetus two months or more after its death. (12 Dec 1998) |
| abortion, multiple | Couples who have had 2 or more miscarriages (spontaneous abortions) have about a 5% chance that one member of the couple is carrying a chromsome translocation responsible for the miscarriages. (12 Dec 1998) |
| abortion rate | The number of abortions per 1000 terminated pregnancies during a given period of time. (05 Mar 2000) |
| abortion, recurrent | See Abortion, habitual. (12 Dec 1998) |
| abortion, septic | Infected abortion in which there is dissemination of microorganisms and their products into the maternal systemic circulation. (12 Dec 1998) |
| abortion, therapeutic | Abortion induced to save the life or health of a pregnant woman. (12 Dec 1998) |
| abortion, threatened | Condition of vaginal bleeding with or without pain in early pregnancy which may presage an abortion. (12 Dec 1998) |
| abortion, veterinary | Premature expulsion of the foetus in animals. (12 Dec 1998) |
| accidental abortion | Abortion due to a fall, blow, or other injury. (05 Mar 2000) |
| ampullar abortion | Abortion resulting from pregnancy in the ampulla of the fallopian tube. (05 Mar 2000) |
| vibrionic abortion | <veterinary> The abortion of cattle or sheep caused by Campylobacter foetus. (05 Mar 2000) |
| menstrual extraction abortion | A technique for aspiration of early products of conception from the uterus a few days after the first missed menstrual period. (05 Mar 2000) |
| missed abortion | An abortion in which the foetus dies in utero but the product of conception is retained in utero for two months or longer. (05 Mar 2000) |
| complete abortion | The complete expulsion or extraction from its mother of a foetus or embryo, complete expulsion of any other product of gestation. (e.g., hydatidiform mole). (05 Mar 2000) |