The Collaborative International Dictionary
Superposable
Superposable \Su`per*pos"a*ble\, a. Capable of being superposed, as one figure upon another.
Wiktionary
superposable
a. (context of two objects English) Able to be superposed on each other in such a way as to coincide exactly
WordNet
superposable
adj. coinciding exactly when superimposed; "identical triangles" [syn: identical]