oedipal

The adjective 'oedipal' is a 20th-century psychoanalytic term coined directly from the name of the tragic Greek hero Oedipus, whose story was central to Sigmund Freud's theory of psychosexual development. Freud used the myth, in which Oedipus unknowingly kills his father and marries his mother, as the archetype for a universal childhood stage. The suffix '-al' was appended to create a standard English adjective meaning "pertaining to Oedipus or the Oedipus complex." Thus, the word's journey is not from ancient morphemes to a modern meaning, but from a specific mythological narrative to a broad psychological concept, with the literal meaning of the original name ("swollen foot") bearing no semantic relation to its modern psychoanalytic usage.

The word is a modern English formation derived from the name Oedipus, a figure in Greek mythology. It is formed by adding the English adjectival suffix '-al' (of or pertaining to) to the proper name. The name 'Oedipus' itself is from Greek Οἰδίπους (Oidipous), traditionally interpreted as "swollen foot" (from oideo, "to swell" + pous, "foot").