Englishfor English speakers
lethal
Adjective
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If something is lethal it might kill you; it causes death.
Cobra's poison is lethal.
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If something was lethal it killed someone or something.
The bite was lethal in only a few hours.
mutation
Noun
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Any alteration or change.
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A change in genetic material (DNA) which can be passed from parents to children.
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A mutant.