NCIt definition : A semi-solid composed of a large proportion of solids and finely dispersed active
and/or inert ingredient(s) in a fat-based vehicle.;
Alternative definition : CDISC: A semisolid dosage form, containing a large proportion (20 - 50%) of solids
finely dispersed in a fatty vehicle. This dosage form is generally for external application
to the skin or mucous membranes. Note: A semisolid is not pourable; it does not flow
or conform to its container at room temperature. It does not flow at low shear stress
and generally exhibits plastic flow behavior. (NCI);