Definition and Citations:
1. A parasitic and infectious microorganism smaller than a bacterium. Incapable of independent metabolic activity. Needs to invade a living organism to derive energy to survive. 2. See computer virus.
1. A parasitic and infectious microorganism smaller than a bacterium. Incapable of independent metabolic activity. Needs to invade a living organism to derive energy to survive. 2. See computer virus.