Definition: Rabbit is a golf side bet that gets its name from the term used to describe a pacesetter. Someone who runs out ahead of the field in a mile run, for example, is called the rabbit. They are out ahead of the pack, setting the pace.
AIDS. n. A severe immunological disorder caused by the retrovirus HIV, resulting in a defect in cell-mediated immune response that is manifested by increased susceptibility to opportunistic infections and to certain rare cancers, especially Kaposi's sarcoma.
HIV is the virus which attacks the T-cells in the immune system. AIDS is the syndrome which appears in advanced stages of HIV infection. HIV is a virus. AIDS is a medical condition.