<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A two-piece dispensing closure that includes a base member the lower portion of which is designed to attach and seal securely to a container finish and the upper portion of which is designed to receive a dispensing spout member. The spout member may be moved upward and downward to open and close the dispensing passageway.</n0:def-definition><n0:def-source>FDA</n0:def-source><n0:attr>Stability</n0:attr></n0:ComplexDefinition>