The word is from the Latin virus referring to poison and other noxious substances, first used in English in 1392.Virulent, from Latin virulentus (poisonous), dates to 1400.A meaning of "agent that causes infectious disease" is first recorded in 1728, before the discovery of viruses by Dmitry Ivanovsky in 1892. The plural is viruses. The adjective viral dates to 1948. The term virion (plural virions), which dates from 1959,is also used to refer to a single, stable infective viral particle that is released from the cell and is fully capable of infecting other cells of the same type.
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