pyxidium
noun
pyx·id·i·um
pikˈsidēəm
plural pyxidia
-ēə
or pyxidiums 1
: a capsular fruit (as in the plantain) that dehisces around its circumference so that the upper portion falls off like a cap compare circumscissile
2
: capsule sense 2b
Word History
Etymology
New Latin, from Greek pyxidion, diminutive of pyxis box