Merriam-Webster Collegiate Dictionary - superposable

 adjective see superpose SUPERPOSE  transitive verb  (-posed; -posing)  Etymology: probably from French ~r, back-formation from superposition, from Late Latin superposition-, superpositio, from Latin superponere to ~, from super- + ponere to place — more at position  Date: 1823  1. to place or lay over or above whether in or not in contact ; superimpose  2. to lay (as a geometric figure) upon another so as to make all like parts coincide  • superposable adjective  • superposition noun