from The American Heritage Dictionary of the English Language, 4th Edition
Any of various simple submicroscopic parasites of plants, animals, and bacteria that often cause disease and that consist essentially of a core of RNA or DNA surrounded by a protein coat. Unable to replicate without a host cell, viruses are typically not considered living organisms.
from The American Heritage Dictionary of the English Language, 4th Edition
Computer Science A computer virus.
from The American Heritage Dictionary of the English Language, 4th Edition
The causative agent of an infectious disease.
from Free Scrabble Dictionary
Any of a large group of submicroscopic infective agents that are regarded either as extremely simple microorganisms or as extremely complex molecules, that typically contain a protein coat surrounding an RNA or DNA core of genetic material but no semipermeable membrane, that are capable of growth and multiplication only in living cells, and that cause various important diseases in humans, lower animals, or plants.
from Free Scrabble Dictionary
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