Definitions

1. noun

A specialized cell in a filamentous cyanobacterium, especially in the genus Anabaena, where nitrogen fixation occurs.

“The scientist studied the heterocysts in the Anabaena culture under a microscope.”

2. noun

A cell in the root nodules of certain legumes, where nitrogen fixation occurs.

“The researcher examined the heterocysts in the root nodules of the pea plant.”