calyptra

noun
ca·lyp·tra | \kə-ˈlip-trə \

Definition of calyptra 

: a hoodlike structure in a plant especially : haploid tissue forming a membranous hood over the capsule in a moss

First Known Use of calyptra

circa 1753, in the meaning defined above

History and Etymology for calyptra

New Latin, from Greek kalyptra veil, from kalyptein to cover — more at hell

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The first known use of calyptra was circa 1753

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Britannica.com: Encyclopedia article about calyptra

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