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aseismic ridge
asepsis
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ascus

as·cus [ áskəss ] (plural as·ci [ ássī, áss kee ])


noun 
Definition:
 
fungal spore case: a membranous spore case formed by specific fungi ascomycetes that contains eight sexually produced spores ascospores

[Mid-19th century. Via modern Latin< Greek askos "wineskin, leather bag"]
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