From taxonomy + -ic.

• IPA: /ˌtæksəˈnɒmɪk/

taxonomic (not comparable)

1. Of, or relating to taxonomy.
   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.: Field Museum of Natural History, →ISBN, page vii:

     With fresh material, taxonomic conclusions are leavened by recognition that the material examined reflects the site it occupied; a herbarium packet gives one only a small fraction of the data desirable for sound conclusions. Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get […]

• French: taxonomique
• German: taxonomisch
• Italian: tassonomico
• Portuguese: taxonômico
• Russian: таксономический
• Spanish: taxonómico