TESTICLE By N., Pam M.S. - April 29, 2013 noun. a testis and its encompassing structures, inclusive of the system of ducts within the scrotum. TESTICLE: "Some men have only one testicle, either due to birth abnormality or injury." Related Psychology Terms MONORCHIDISM ARRESTED TESTIS INTERSTITIAL CELL TESTICULAR ATROPHY TESTIS PSEUDOHERMAPHRODITISM ONTOANALYSIS AUDITORY LABYRINTH DAMPING VOCAL TRACT Cite this page: N., Pam M.S., "TESTICLE," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/testicle/ (accessed April 1, 2020).