(genetics) a virus or other agent that is used to deliver DNA to a cell | (virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein |
a variable quantity that can be resolved into components | a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer |
any agent (person or animal or microorganism) that carries and transmits a disease | a harmful or corrupting agency |
a straight line segment whose length is magnitude and whose orientation in space is direction | |