Entry 1 sense Webster, 1913 Pederast /pĕd'ə-răst'/ · Ped·er·ast · IPA /ˈpɛd.ɚ.ɹæst/ 01 n. A man who is engaged in an erotic relationship with an adolescent boy; a practitioner of pederasty. 1. A man who is engaged in an erotic relationship with an adolescent boy; a practitioner of pederasty.