Source : Webster's Revised Unabridged Dictionary (1913)

Molendinaceous \Mo*len`di*na"ceous\, Molendinarious
\Mo*len`di*na"ri*ous\, a. [L. molendinarius, fr. molendinum a
   mill, fr. molere to grind.] (Bot.)
   Resembling the sails of a windmill.