n (context|founding) The surface of the sand of one section of a mould where it meets that of another section.
n (chemistry) The separation and determination of alloys; especially, the separation, as by acids, of gold from silver in the assay button.
n (mineralogy) lamellar | Lamellar separation in a crystallized mineral, due to some other cause than cleavage, as to the presence of twinning lamellae.