| threatened | A species likely to become endangered in the foreseeable future. (05 Dec 1998) |
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| threatened abortion | <obstetrics> A clinical diagnosis that is made in females in the first trimester of pregnancy who present with vaginal bleeding and lower abdominal pain. This diagnosis can only be made after all other causes for these same symptoms have been excluded, through testing and physical examination. (27 Sep 1997) |
| threatened species | <biology, ecology, zoology> Any species which is likely to become an endangered species within the foreseeable future throughout all or a significant portion of its range. (09 Oct 1997) |
| threatened, endangered, and sensitive species | formal classifications of species. Sensitive Species for which population viability is a concern. Sensitive species are not federally designated under the Endangered Species act. The U.S. Fish and Wildlife Service, after study, makes the following designations (05 Dec 1998) |
| abortion, threatened | Condition of vaginal bleeding with or without pain in early pregnancy which may presage an abortion. (12 Dec 1998) |
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