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biosignature
biosignature n. 
/ˌbaɪoʊˈsɪɡnəˌtʃʊ(ə)r/ a chemical or physical indication of the presence of life (currently or in the past) on a planet, in a stratum, etc.
Brit. /ˌbʌɪə(ʊ)ˈsɪɡnətʃə/
, /ˌbʌɪə(ʊ)ˈsɪɡnətʃə/U.S. /ˌbaɪoʊˈsɪɡnətʃər/
, /ˌbaɪoʊˈsɪɡnətʃər//ˌbaɪoʊˈsɪɡnəˌtʃʊ(ə)r/ΚΠ
1995 Exobiological Strategy for Mars Explor. (NASA Techn. Rep. SP-530) 2/2 The search for ancient life on Mars will involve a logically designed sequence of missions, each of which will focus on defining ever more closely where and how biosignatures may be found.
2002 Times Educ. Suppl. 27 Sept. 16/1 The researchers used a biosignature—a physical and/or chemical marker of life—to compare the crystals in the Mars meteorite with those produced from bacteria on Earth.
2007 M. Endl & W. D. Cochran in L.-A. McFadden et al. Encycl. Solar Syst. (ed. 2) xlvii. 902/2 Of particular interest will be whether the spectra also include so-called biosignatures, like absorption by molecular oxygen (or ozone) or methane.
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