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From Biology-Online Dictionary
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1. Capable of causing death; mortal; fatal; destructive; certain or likely to cause death; as, a deadly blow or wound.

2. Aiming or willing to destroy; implacable; desperately hostile; flagitious; as, deadly enemies. Thy assailant is quick, skillful, and deadly. (Shak)

3. Subject to death; mortal.

(Science: botany) deadly nightshade, a poisonous plant; belladonna. Of an instrument of certain death; deadly poisons; lethal weapon; a lethal injection.