from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A large, thick-walled, transparent cell that occurs at intervals along the filaments of certain cyanobacteria.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A specialized nitrogen-fixing cell formed by some filamentous cyanobacteria.
from the GNU version of the Collaborative International Dictionary of English
- n. A cell larger than the others, and of different appearance, occurring in certain algæ related to nostoc.
from The Century Dictionary and Cyclopedia
- n. In botany, one of a class of abnormal cells found in algæ of the order Nostocaceæ.
hetero- + cyst (Wiktionary)