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aseptic (adj.)

"free from the micro-organisms that cause putrefaction or fermentation," 1855, from a- (3) "not" + septic. As a noun, "aseptic substance," from 1884.

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Definitions of aseptic from WordNet

aseptic (adj.)
free of or using methods to keep free of pathological microorganisms;
aseptic surgical techniques
aseptic surgical instruments
Synonyms: sterile
From wordnet.princeton.edu