3. A surface or line of separation where a division occurs.
4. (Founding)
Defn: The surface of the sand of one section of a mold where it meets that of another section.
5. (Chem.)
Defn: The separation and determination of alloys; esp., the separation, as by acids, of gold from silver in the assay button.
6. (Geol.)
Defn: A joint or fissure, as in a coal seam.
7. (Naut.)
Defn: The breaking, as of a cable, by violence.
8. (Min.)