| AVA | activity vector analysis; antiviral antibody; aortic valve area; aortic valve atresia; arteriovenous... |
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| DVCC | Disease Vector Control Center |
| EHV | electric heart vector; equine herpes virus |
| GRV | ground reaction vector |
| IVC | inferior vena cava; inspiratory vital capacity; integrated vector control; intravascular coagulation... |
| species indeterminata | <zoology> Undetermined species, one not identifiable with the description for a name already published. Usually given with a generic name only. (09 Jan 1998) |
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| species inquirendum | <zoology> A species to be queried, a doubtfully identified species requiring further investigation. (09 Jan 1998) |
| species-specific | Applying only to a particular species, said of effects that vary depending on the species in question. (09 Oct 1997) |
| species-specific antigen | Antigenic components in the tissues and fluids of members of a species of animal, by means of which various species may be immunologically distinguished; e.g., serum albumin of horses is immunologically different from that of man, dogs, sheep, and so on. (05 Mar 2000) |
| species specificity | Restriction of a characteristic or response to the members of one species; it usually refers to that property of the immune response which differentiates one species from another on the basis of antigen recognition, but the concept is not limited to immunology and is used loosely at levels higher than the species. (12 Dec 1998) |
| species tolerance | The insensitivity to a particular drug exhibited by a particular species. (05 Mar 2000) |
| noncommercial species | Tree species that do not normally develop into suitable trees for conventional forest products because of small size, poor form, or inferior quality. (05 Dec 1998) |
| dominant species | <biology, ecology, zoology> For each stratum, dominant species are those that, when ranked in descending rank order and cumulatively totaled, immediately exceed 50 percent of the total dominance measure, plus any additional species comprising 20 percent or more of the total dominance measure for the stratum. (09 Oct 1997) |
| intermediate species | <chemistry> Species formed in a reaction consisting of more than one step. An intermediate is produced in one reaction and consumed in the following reaction. (09 Jan 1998) |
| invasive species | Non-native species disrupting and replacing native species. (09 Oct 1997) |
| te&s species | See Threatened, endangered, and sensitive species. (05 Dec 1998) |
| early seral species | <plant biology> Shrubs, such as ceanothus, and hardwoods, usually in tree form, such as red alder, bitter cherry and big leaf maple. These species start growing in natural succession soon after a disturbance (fire or logging). (05 Dec 1998) |
| 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) |
| 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) |
| endangered species | Any species which is in danger of extinction throughout all or a significant portion of its range. (09 Oct 1997) |