| arachnid vectors | Members of the class arachnida, especially spiders, scorpions, mites, and ticks, which transmit infective organisms from one host to another or from an inanimate reservoir to an animate host. (12 Dec 1998) |
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| arachnid | <biology> An organism of the class Arachnida in the kingdom Animalia. For example: a spider. (09 Oct 1997) |
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| arthropod vectors | Arthropods, other than insects and arachnids, which transmit infective organisms from one host to another or from an inanimate reservoir to an animate host. Arachnid vectors and insect vectors are also available. (12 Dec 1998) |
| genetic vectors | Plasmids, bacteriophages, or viruses used during recombinant DNA techniques that transport foreign genes into recipient cells. Genetic vectors possess a functional replicator site and contain a genetic marker to facilitate their selective recognition. (12 Dec 1998) |
| disease vectors | Invertebrates or non-human vertebrates which transmit infective organisms from one host to another. For human vectors the preferred term is carrier state. (12 Dec 1998) |
| yeast vectors | <molecular biology> Yeast cells that contain genes. (11 May 1997) |