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Definition of Cleistothecium
1. Noun. Closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration.
Medical Definition of Cleistothecium
1. In fungi, an ascocarp that is closed, with randomly dispersed asci. Origin: G. Kleistos, enclosed, + theke, box (05 Mar 2000)