culet

— The Turk prosecuted his advantage to the uttermost of his power; yet the other[…]not onely avoided the Turkes violence, but having drawne his Faulchion, pierced the Turke so under the Culets thorow backe and body, that although he alighted from his horse, he stood not long ere hee lost his head, as the rest had done.

— 1999, John W. Kenney, III, 7. Pressure Effects on Emissive Materials, D. Max Roundhill, John P. Fackler Jr. (editors), Optoelectronic Properties of Inorganic Compounds, Plenum Press, page 234, The common diamond cut for high pressure work is the modified brilliant cut (see Fig. 1) in which the point of a brilliant cut diamond (i.e., the type of diamond commonly found in an engagement ring) is lopped off to provide a flat surface, called a culet, for pressure transmission. Two opposed diamond culets, separated by a thin, extrudable metal gasket into which a small sample hole is drilled, are squeezed together mechanically to reduce the volume of a hydrostatic medium and thereby increase the pressure of the sample as shown in Fig. 1.