pedion
noun
ped·i·on
ˈpedēən,
ˈpēd-
plural pedia
-dēə
: a form of crystal having only a single face and belonging to the rare asymmetric class of the triclinic system
Word History
Etymology
New Latin, from Greek, plain, flat surface, from pedon ground; akin to Latin oppido thoroughly, Old Norse fet step, Sanskrit pada step, track, Latin ped-, pes foot