The Collaborative International Dictionary of English v.0.48:

Dichlamydeous \Di`chla*myd"e*ous\
   (d[imac]`kl[.a]*m[i^]d"[-e]*[u^]s), a. [Gr. di- = di`s- twice
   + chlamy`s, chlamy`dos, a cloak.] (Bot.)
   Having two coverings, a calyx and a corolla.
   [1913 Webster]