Webster's English Dictionary

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lethal

Cross references:
  1. deadly                
 
1. le.thal \'le--th*l\ \le--'thal-*t-e-\ \'le-th-(*-)le-\ aj [L letalis, 
   lethalis, fr. letum death] 1: of, relating to, or causing death  2: capable 
   of causing death  - le.thal.i.ty n
2. lethal n 1: an abnormality of genetic origin causing the death of the 
   organism posse ssing it 2: LETHAL GENE