a cell-free filtrate held to be a virus responsible for a specific neoplasm
an abnormal new mass of tissue that serves no purpose
(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 harmful or corrupting agency
a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer
