Monochlamydeous \Mon`o*chla*myd"e*ous\, a. [Mono- + Gr. ?, ?,
cloak: cf. F. monochlamyd['e].] (Bot.)
Having a single floral envelope, that is, a calyx without a
corolla, or, possibly, in rare cases, a corolla without a
calyx.
[1913 Webster]