Webster's English Dictionary

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noxious

Cross references:
  1. pernicious            
 
nox.ious \'na:k-sh*s\ aj [L noxius, fr. noxa harm; akin to L noce-re to 
   harm, ne]c-, nex violent death, Gk nekros dead body 1: HARMFUL, DESTRUCTIVE 
    2: morally corrupting : PERNICIOUS {a ~ doctrine}  3: DISTASTEFUL, 
   OBNOXIOUS  - nox.ious.ly av