sphenopsid

noun
sphe·nop·sid | \ sfi-ˈnäp-səd \

Definition of sphenopsid 

: any of a class or division (Sphenopsida or Sphenophyta) of primitive vascular plants characterized by jointed ribbed stems, small leaves usually in whorls at distinct stem nodes, and sporangia in sporangiophores and made up of the horsetails and extinct related forms

First Known Use of sphenopsid

1957, in the meaning defined above

History and Etymology for sphenopsid

ultimately from Greek sphēn wedge + New Latin -opsis

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The first known use of sphenopsid was in 1957

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