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calypter

noun
ca·​lyp·​ter | \kəˈliptə(r), ˈkalə̇p-\
plural calypters\ -​ə(r)z \ or calypteres\ ˌkalə̇pˈti(ə)(ˌ)rēz \

Definition of calypter 

1 : the alula of a two-winged fly especially when large enough to cover the halter

2 : calyptra

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History and Etymology for calypter

New Latin, from Greek kalyptēr sheath, from kalyptein to cover, conceal

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