plural noun
Cal·a·mi·ta·ce·ae | \ ˌkaləˌmīˈtāsēˌē , -məˈt- \

Definition of Calamitaceae 

: a family of fossil plants coextensive with Calamariaceae used by strict adherents to the International Rules of Botanical Nomenclature

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History and Etymology for Calamitaceae

New Latin, from Calamites, type genus + -aceae

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the setting in which something occurs

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