The Collaborative International Dictionary of English v.0.48:

Menispermaceous \Men`i*sper*ma"ceous\, a. [Gr. mh`nh the moon +
   spe`rma seed.] (Bot.)
   Pertaining to a natural order (Menispermaceae) of climbing
   plants of which moonseed (Menispermum) is the type.
   [1913 Webster]