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heterocyst

[het-er-uh-sist]
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noun Bacteriology.
  1. one of the enlarged nitrogen-fixing cells occurring along the filaments in some blue-green algae.

Origin of heterocyst

First recorded in 1870–75; hetero- + cyst
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018