heterocyst definition

  • noun:
    • a big, thick-walled, transparent cell that develops at intervals over the filaments of certain cyanobacteria.
    • A specialized nitrogen-fixing cellular formed by some filamentous cyanobacteria.
    • A cell larger than the others, as well as different appearance, happening in a few algæ about nostoc.
    • In botany, one of a class of abnormal cells found in algæ of the order Nostocaceæ.

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