n. in psychoanalytic theory, refers to the concept that infants envy the mother's breast for its capacity to nourish, comfort, and create. In the later stages of psychosexual development, the adult's envy may be transformed into that of penis envy. Described in Envy and Gratitude (1957) by Melanie Klein.

BREAST ENVY: "Psychoanalytic theory suggests that breast envy occurs in the infant's personality."