(psychoanalysis) a female's presumed envy of the male's penis; said to explain femininity WordNet 3.0 & Open English WordNet

Penis envy is a stage in Sigmund Freud's theory of female psychosexual development, in which young girls experience anxiety upon realization that they do not have a penis. Wikipedia

In Freudian psychoanalysis, the female psychosexual developmental stage when young girls experience anxiety upon realizing that they lack a penis; begins the transition from attachment to the mother to competition with the mother for the father Wikidata

In Freudian psychoanalysis the assumption that it is a defining moment for girls when they realize that they don't have a penis and that they envy boys for it. OmegaWiki

The unconscious desire of a woman to possess a penis. Wiktionary

Unconscious desire. Wiktionary (translation)