Phytotoxin

Part of speech: noun

Definitions

1. A toxic compound that is synthesized by certain plant species, which can cause harm to other organisms
2. A harmful chemical that is generated by plants and can adversely affect other living entities
3. A chemical generated naturally by some plants that can be poisonous to other organisms

Etymology: Ancient Greek "phyton" meant "plant," and the "phyto-" in "phytotoxin" carries that sense straight through from the Greek word. The "toxin" half has a longer and more dramatic path. It comes from Ancient Greek "toxikon," meaning poison for arrows, built from "toxon," the word for bow. Poisons were smeared on arrowheads, so a poison's name came from the weapon it rode on. Romans borrowed the idea as "toxicum," and the English "toxin" was built from that Latin base with the "-in" suffix used for chemical substances. "Phytotoxin" is a plain compound: a plant-derived prefix joined to the modern chemical term. Its formation reflects the scientific habit of combining classical roots to name newly identified substances, so the word belongs to the modern vocabulary of chemistry rather than to ancient usage.