NAIL BITING By Nugent, Pam M.S. - April 7, 2013 is the habitual biting of ones fingernails. Otherwise known as onychophagia. NAIL BITING: "Nail biting is a habit which is observed during intervals of boredom or anxiety." Related Psychology Terms MORSICATIO BUCCARUM ORAL-BITING PHASE LIP BITING ORAL STAGE SADISM TRICHOPHAGY NERVOUS HABIT ORAL BEHAVIOR MOTOR HABIT SEXUAL CONTACT Cite this page: Nugent, Pam M.S., "NAIL BITING," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/nail-biting/ (accessed June 25, 2017).