pseudo-monocotyledonous

from The Collaborative International Dictionary of English v.0.48

Pseudo-monocotyledonous \Pseu`do-mon`o*cot`y*led"on*ous\, a.
   [Pseudo- + monocotyledonous.] (Bot.)
   Having two coalescent cotyledons, as the live oak and the
   horse-chestnut.
   [1913 Webster]