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ri·cin·ole·ic acid .rīs-ən-ō-.lē-ik-, .ris-, -.lā- n an oily unsaturated hydroxy fatty acid C18H34O3 that occurs in castor oil as a glyceride
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ri·cin·ole·ic ac·id (ri″sin-o-leґik) 1. an unsaturated 18-carbon fatty acid constituting 80 per cent of the fatty acid content of castor oil. 2. a mixture of fatty acids obtained by hydrolysis of castor oil and used intravaginally to restore or maintain normal vaginal acidity.Medical dictionary. 2011.