What does oxytocin mean?
Oxytocin is a peptide hormone produced in the hypothalamus and released from the posterior pituitary. Its best-established functions are medical: during childbirth it helps stimulate and coordinate uterine contractions, and after delivery it causes the breasts to eject milk in response to nursing. Synthetic oxytocin is therefore sometimes administered to induce or strengthen labor. Oxytocin also participates in sexual behavior, attachment, trust, stress responses, and other forms of social communication. These broader effects have made it popular in discussions of intimacy, where it is often called the “love hormone,” but that nickname is a simplification rather than an accurate scientific description. Human oxytocin systems are complex, and the effects of both endogenous oxytocin and administered synthetic oxytocin vary according to dose, circumstances, and individual differences. The word is consequently common in medicine, neuroscience, psychology, and popular writing about relationships.
A peptide hormone that stimulates uterine contractions during childbirth and causes milk ejection from the breasts.
"Oxytocin levels increase as labor progresses."
The medical substance may be endogenous or synthetic; synthetic oxytocin is used to induce or strengthen labor.
Informally, oxytocin as an agent associated with romantic attachment, bonding, trust, or emotional closeness.
"The study examined whether oxytocin could influence participants' willingness to trust strangers."
The expression “love hormone” is popular but scientifically imprecise, and findings about social behavior are context-dependent.
Oxytocin is normally used as a mass noun and does not require a plural; the plural form is uncommon.
"Researchers compared the effects of different oxytocins in laboratory settings."
Oxytocin turns childbirth into a coordinated biological event—and it is also a central signal in nursing, bonding, and social behavior.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does oxytocin come from?
The name oxytocin was formed in the early 20th century from Greek roots meaning “sharp” or “acute” and “childbirth,” reflecting the hormone's ability to stimulate uterine contractions. Its later name is a deliberate renaming of an earlier substance called lactotoxin, which had been identified in connection with milk ejection. Related medical terms such as tocolysis and tokography draw on the same Greek root associated with childbirth.
Related word forms
How oxytocin is actually used
In medicine, the term usually refers to the hormone itself or to synthetic preparations used to induce or strengthen labor and, less commonly, to treat postpartum bleeding. The popular expression “love hormone” is informal and can overstate the evidence for oxytocin as a single cause of bonding or attachment.