Pyxidium \Pyx*id"i*um\, n.; pl. Pyxidia. [NL., fr. Gr. ?, dim.
a ? a box. See Pyx.] (Bot.)
(a) A pod which divides circularly into an upper and lower
half, of which the former acts as a kind of lid, as in
the pimpernel and purslane.
(b) The theca of mosses.
[1913 Webster]
