per·vert 
(pər-vûrt)
(pər-vûrt)tr.v. per·vert·ed, per·vert·ing, per·verts
1. To cause to turn away from what is right, proper, or good; debase: "yet another example of justice being perverted in an attempt to secure more convictions" (Economist).
2. To corrupt (someone) morally. See Synonyms at corrupt.
3. To interpret incorrectly; misconstrue or distort: an analysis that perverts the meaning of the poem.
n. (pûrvûrt′)
A person whose sexual practices or interests are considered abnormal or deviant.
[Middle English perverten, from Old French pervertir, from Latin pervertere : per-, per- + vertere, to turn; see wer-2 in the Appendix of Indo-European roots.]
per·verter n.
per·verti·ble adj.