Etymology

oocyst

O1O1C3Y4S1T1

Today it means: A reproductive cell in certain fungi. Full definition →

First used 19th c.
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The story

From oo- + cyst.

First known use, by meaning

  • from 19th c. A reproductive cell in certain fungi.
  • from 20th c. A thick-walled spore in the lifecycle of some parasitic protozoans that develops into sporozoite.

Etymology from Wiktionary, CC BY-SA 4.0.