GNU Collaborative International Dictionary of English

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Found one definition

1.       
   cortina (kôr‑tīˈnȧ or kôr‑tēˈnȧ), n.; pl. cortinae (kôr‑tēˈnē). (Biology) a cobwebby remnant of the partial veil which in some mature mushrooms hang from the edges of the cap.
   
   [WordNet 1.5 +PJC]