plano-, plan-, plani-

(Latin: flat, even, level, smooth)

explain
explainable (adjective)
explainer
explanation
explanatory
pedoplania
Flattening of the foot or feet.
plain
plainly
plalnicaudate
Having a flat tail, as certain reptiles.
plan
plane
planer
planicipital
Having a flat head, as an insect; flat-headed.
planidorsate
Having a flat back.
planifolious
Having or consisting of flat leaves; applied to composite flowers consisting wholly of ligulate florets.