Dictionary
eq•ui•se•toid
Pronunciation: (ek"wu-sē'toid), [key]—
n.
any plant of the phylum or division Equisetophyta (or Sphenopsida), including the horsetails and many extinct species of the Carboniferous Period. Also called
sphenopsid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.