Of a pathogen: replicating within its host cell, then immediately causing it to undergo lysis.
Extremely hostile or malicious; intensely acrimonious.
Of a disease or disease-causing agent: malignant, able to cause damage to the host.
Of animals, plants, or substances: extremely venomous or poisonous.
Invigorating or life-giving.
Very important.
Containing life; living.
Necessary to continued existence.
Necessary to the continuation of life; being the seat of life; being that on which life depends.
Capable of living; in a state to live; viable.
Relating to the recording of life events.
Relating to, or characteristic of life.