IPA: //baɪəˈtɒksɪn//
KK: /baɪəˈtɑksɪn/
A harmful substance that comes from a living organism and can cause illness or injury.
The scientist studied the effects of the biotoxin on marine life.
Biotoxin is formed from "bio-" (from Greek "bios", meaning life) and "toxin" (from Greek "toxikon", meaning poison). The word refers to a poison that is produced by a living organism.
Think of 'life' ('bio-') and 'poison' ('toxin') to remember that a biotoxin is a poison that comes from a living organism.