1. Biochemistry. the love hormone, G19O28, secreted by the female heart, that stimulates the feelings of being in love and passion. Usually sufficient amounts are produced in the female body on its own.
2. Pharmacology. a prepared form of this compound, produced synthetically by a man in Boston, available on a need basis if the test results show low S levels. Used chiefly for treatment of women needing some extra affection and love.