English-Thai Dictionary
cupel
N ถ้วย เล็กๆ มี รู พรุน tuai-lek lek-me-ru-prun
Webster's 1828 Dictionary
CUPEL
n.[L., a little cup. ] A small cup or vessel used in refining metals. It retains them while in a metallic state, but when changed by fire into a fluid scoria, it absorbs them. Thus when a mixture of lead with gold or silver is heated in a strong fire, the lead is oxydated and vitrified, and sinks into the substance of the cupel, while the gold or silver remains pure. This kind of vessel is made usually of phosphate of lim, or the residue of burnt bones, rammed into a mold, which gives it its figure.
CUPELLATION
n.The refining of gold or silver by a cupel or by scorification.
Webster's 1913 Dictionary
CUPEL
Cu "pel (k "pl ), n. Etym: [LL. cupella cup (cf. L. cupella, small cask, dim. of cupa ): cf. F. coupelle. See Cup, and cf. Coblet.]
Defn: A shallow porus cup, used in refining precious metals, commonly made of bone ashes (phosphate of lime ). [Written also coppel. ] Cupel dust, powder used in purifying metals.
CUPEL
Cu *pel " (k-pl "), v. t. [imp. & p. p. Cupelled (-pld "); p. pr. & vb. n. Cupelling.]
Defn: To refine by means of a cupel.
CUPELLATION
Cu `pel *la "tion (k `pl-l "shn ), n. Etym: [See Cupel. ]
Defn: The act or process of refining gold or silver, etc. , in a cupel.
Note: The process consist in exposing the cupel containing the metal to be assayed or refined to a hot blast, by which the lead, copper, tin, etc. , are oxidized, dissolved, and carried down into the porous cupel, leaving the unoxidizable precious metal. If lead is not already present in the alloy it must be added before cupellation.
New American Oxford Dictionary
cupel
cu pel |kyo͞oˈpel, ˈkyo͞opəl kjuˈpɛl | ▶noun a shallow, porous container in which gold or silver can be refined or assayed by melting with a blast of hot air, which oxidizes lead or other base metals. ▶verb ( cupels, cupeling, cupeled; Brit. cupels, cupelling, cupelled ) [ with obj. ] assay or refine (a metal ) in such a container. DERIVATIVES cu pel la tion |ˌkyo͞opəˈlāSHən |noun ORIGIN early 17th cent. (as a noun ): from French coupelle, diminutive of coupe ‘goblet. ’
Oxford Dictionary
cupel
cupel |ˈkjuːp (ə )l | ▶noun a shallow, porous container in which gold or silver can be refined or assayed by melting with a blast of hot air which oxidizes lead or other base metals. ▶verb ( cupels, cupelling, cupelled; US cupels, cupeling, cupeled ) [ with obj. ] assay or refine (a metal ) in a cupel. DERIVATIVES cupellation |-ˈleɪʃ (ə )n |noun ORIGIN early 17th cent. (as a noun ): from French coupelle, diminutive of coupe ‘goblet ’.
The Wordsmith Dictionary