CYCADEOID

[cy.cad.e.oid] n [NL Cycadeoidales, group name, ultim. fr. Cycad-, Cycas] (1928): any of an extinct order (Cycadeoidales or Bennettitales) of Mesozoic cycadophytes that differ from the cycads chiefly in having the reproductive organs on the trunk embedded in a thick external covering of persistent leaf bases