Acronym for ‘Acquired Immunodeficiency Syndrome,’ a disease caused by the Human Immunodeficiency Virus (HIV). A person may be infected with HIV for many years before becoming severely immune deficient. Infected individuals who do not realize they are infected can easily infect others through exchange of body fluids through sex and needle sharing.
A comparison between two things that share certain features or between a part of one thing and another thing. Evolutionary biologists use the term to indicate functional similarity between organisms that have developed similar features because of a common environment rather than ...