a glass vessel, used in cupping, in which a partial vacuum is created, as by heat.
Origin
1535-45
British Dictionary definitions for cupping glass
cupping glass
noun
1.
(med, archaic) a glass vessel from which air can be removed by suction or heat to create a partial vacuum: formerly used in drawing blood to the surface of the skin for slow bloodletting Also called artificial leech
cupping glass in Medicine
cupping glassn. A glass vessel from which the air has been exhausted by heat or suction, applied to the skin to draw blood to the surface for therapeutic purposes. Also called cup.