pe·nol·o·gy also poe·nol·o·gy 
(pē-nŏlə-jē)
(pē-nŏlə-jē)n.
The study, theory, and practice of prison management and criminal rehabilitation.
[Latin poena, penalty (from Greek poinē; see kwei-1 in the Appendix of Indo-European roots) + -LOGY.]
pe′no·logi·cal (pē′nə-lŏjĭ-kəl) adj.
pe′no·logi·cal·ly adv.
pe·nolo·gist n.