Origin and history of taxine

1660s, "of or pertaining to poisons, poisonous," 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," which has been regarded as a loan-word from Scythian.

Watkins suggests a possible source in Iranian taxša- "bow" (from PIE *tekw- "to run, flee"). Beekes, pointing to the early attestation of the Greek word, suggests a Pre-Greek origin.

As a noun from 1890. Related: Toxical. Compare intoxicate. Toxic waste is by 1888 in medicine, "toxin;" by 1955 as "chemical or radioactive waste."

also -in, adjectival word-forming element, Middle English, from Old French -in/-ine, or directly from Latin suffix -inus/-ina/-inum "of, like," forming adjectives and derived nouns, as in divinus, feminus, caninus; from PIE adjectival suffix *-no- (see -en (2)).

The Latin suffix is cognate with Greek -inos/-ine/-inon, and in some modern scientific words the element is from Greek. Added to names, it meant "of or pertaining to, of the nature of" (Florentinus), and so it also was commonly used in forming Roman proper names, originally appellatives (Augustinus, Constantinus, Justinus, etc.) and its descendants in Romanic languages continued active in name-forming. The Latin fem. form, -ina, was used in forming abstracts (doctrina, medicina). Relics of the attempt to continue a distinction between Latin -ina and -inus account for the English hesitation in spelling between -in and -ine.