Definitions

1. noun

A group of naturally occurring, extremely toxic compounds found in the cyanobacterium Anabaena flos-aquae, produced as a byproduct of nitrogen fixation and capable of killing small animals and even humans in very small quantities.

“The researchers studied the effects of anatoxin on aquatic ecosystems.”

2. adjective

Extremely toxic, especially in small quantities.

“The anatoxin in the lake was so potent that even a small amount could be deadly to humans and animals.”