Source : Webster's Revised Unabridged Dictionary (1913)

Antiseptic \An`ti*sep"tic\, Antiseptical \An`ti*sep"tic*al\, a.
   Counteracting or preventing putrefaction, or a putrescent
   tendency in the system; antiputrefactive.

   {Antiseptic surgery}, that system of surgical practice which
      insists upon a systematic use of antiseptics in the
      performance of operations and the dressing of wounds.

Antiseptic \An`ti*sep"tic\, n.
   A substance which prevents or retards putrefaction, or
   destroys, or protects from, putrefactive organisms; as, salt,
   carbolic acid, alcohol, cinchona.

Source : WordNet®

antiseptic
     n : a substance that destroys micro-organisms that carry disease
         without harming body tissues

antiseptic
     adj 1: thoroughly clean and free of or destructive to
            disease-causing organisms; "doctors in antiseptic
            green coats"; "the antiseptic effect of alcohol"; "it
            is said that marjoram has antiseptic qualities" [ant:
            {septic}]
     2: clean and honest; "antiseptic financial practices"
     3: freeing from error or corruption; "the antiseptic effect of
        sturdy criticism"
     4: made free from live bacteria or other microorganisms;
        "sterilized instruments" [syn: {sterilized}, {sterilised}]
     5: (extended sense) of exceptionally clean language; "lyrics as
        antiseptic as Sunday School"