lethal

adjective

  1. Of, relating to, or causing death

    "death by lethal injection"

  2. Capable of causing death

    "lethal chemicals"

  3. Gravely damaging or destructive devastating

    "a lethal attack on his reputation"

  4. Very potent or effective

    "a lethal fastball"

noun

  1. An abnormality of genetic origin causing the death of the organism possessing it
  2. Lethal gene

noun

  1. A gene that in some (such as homozygous) conditions may prevent development or cause the death of an organism or its germ cells

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