Superimpose \Su`per*im*pose"\, v. t. [imp. & p. p. Superimposed; p. pr. & vb. n. Superimposing.]

To lay or impose on something else; as, a stratum of earth superimposed on another stratum. -- Su`per*im`po*si"tion, n. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

superimposed adj
1: added or imposed without integration; "the superimposed symbolism lacked validity"; "superimposed periodic variation"
2: placed on or over something else; "an overlying image" [syn: overlying]
3: with one layer on top of another; "superimposed rocks" [syn: layered]

Source: WordNet (r) 2.0
 

Superimpose \Su`per*im*pose"\, v. t. [imp. & p. p. Superimposed; p. pr. & vb. n. Superimposing.]

To lay or impose on something else; as, a stratum of earth superimposed on another stratum. -- Su`per*im`po*si"tion, n.

Source: Webster's Revised Unabridged Dictionary (1913)