Webster's English Dictionary

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antibiotic

1. an.ti.bi.ot.ic \.ant-i-(.)bi--'a:t-ik, .an-.ti--, -be--\ \-i-k(*-)le-\ 
   aj 1: tending to prevent, inhibit, or destroy life  2: of or relating to 
   antibiosis or antibiotics  - an.ti.bi.ot.i.cal.ly av
2. antibiotic n : a substance produced by a microorganism and able in 
   dilute solution to i nhibit or kill another microorganism