Toxic
mid 17th century: from medieval Latin toxicus ‘poisoned’, from Latin toxicum ‘poison’, from Greek toxikon (pharmakon) ‘(poison for) arrows’, from toxon ‘bow’.
wiktionary
Borrowed from French toxique, from Late Latin toxicus(“poisoned”), from Latin toxicum(“poison”), from Ancient Greek τοξικόν(toxikón) [ φάρμακον(phármakon)] ("poison for use on arrows"), from τοξικός(toxikós, “pertaining to arrows or archery”), from τόξον(tóxon, “bow”).
etymonline
toxic (adj.)
1660s, from French toxique and directly from Late Latin toxicus "poisoned," from Latin toxicum "poison," from Greek toxikon (pharmakon) "(poison) for use on arrows," from toxikon, neuter of toxikos "pertaining to arrows or archery," and thus to a bow, from toxon "bow," probably from a Scythian word that also was borrowed into Latin as taxus "yew." Watkins suggests a possible source in Iranian taxša- "bow," from PIE *tekw- "to run, flee." As a noun from 1890. Toxic waste is by 1888 in medicine, "toxin;" by 1955 as "chemical or radioactive waste."
