Platinum lamp
Platinum Plat"i*num, n. [NL., fr. Sp. platina, from plata silver, LL. plata a thin plate of metal. See {Plate}, and cf. {Platina}.] (Chem.) A metallic element of atomic number 78, one of the noble metals, classed with silver and gold as a precious metal, occurring native or alloyed with other metals and also as the platinum arsenide (sperrylite). It is a heavy tin-white metal which is ductile and malleable, but very infusible (melting point 1772[deg] C), and characterized by its resistance to strong chemical reagents. It is used for crucibles in laboratory operations, as a catalyst, in jewelry, for stills for sulphuric acid, rarely for coin, and in the form of foil and wire for many purposes. Specific gravity 21.5. Atomic weight 195.1. Symbol Pt. Formerly called {platina}. [1913 Webster +PJC]

{Platinum black} (Chem.), a soft, dull black powder, consisting of finely divided metallic platinum obtained by reduction and precipitation from its solutions. It absorbs oxygen to a high degree, and is employed as an oxidizer.

{Platinum lamp} (Elec.), a kind of incandescent lamp of which the luminous medium is platinum. See under {Incandescent}.

{Platinum metals} (Chem.), the group of metallic elements which in their chemical and physical properties resemble platinum. These consist of the light platinum group, viz., rhodium, ruthenium, and palladium, whose specific gravities are about 12; and the heavy platinum group, viz., osmium, iridium, and platinum, whose specific gravities are over 21.

{Platinum sponge} (Chem.), metallic platinum in a gray, porous, spongy form, obtained by reducing the double chloride of platinum and ammonium. It absorbs oxygen, hydrogen, and certain other gases, to a high degree, and is employed as an agent in oxidizing. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • platinum lamp — noun An electric lamp with a platinum filament • • • Main Entry: ↑platinum …   Useful english dictionary

  • Platinum — Plat i*num, n. [NL., fr. Sp. platina, from plata silver, LL. plata a thin plate of metal. See {Plate}, and cf. {Platina}.] (Chem.) A metallic element of atomic number 78, one of the noble metals, classed with silver and gold as a precious metal,… …   The Collaborative International Dictionary of English

  • Platinum black — Platinum Plat i*num, n. [NL., fr. Sp. platina, from plata silver, LL. plata a thin plate of metal. See {Plate}, and cf. {Platina}.] (Chem.) A metallic element of atomic number 78, one of the noble metals, classed with silver and gold as a… …   The Collaborative International Dictionary of English

  • Platinum metals — Platinum Plat i*num, n. [NL., fr. Sp. platina, from plata silver, LL. plata a thin plate of metal. See {Plate}, and cf. {Platina}.] (Chem.) A metallic element of atomic number 78, one of the noble metals, classed with silver and gold as a… …   The Collaborative International Dictionary of English

  • Platinum sponge — Platinum Plat i*num, n. [NL., fr. Sp. platina, from plata silver, LL. plata a thin plate of metal. See {Plate}, and cf. {Platina}.] (Chem.) A metallic element of atomic number 78, one of the noble metals, classed with silver and gold as a… …   The Collaborative International Dictionary of English

  • Lamp — (l[a^]mp), n. [F. lampe, L. lampas, adis, fr. Gr. ?, ?, torch, fr. ? to give light, to shine. Cf. {Lampad}, {Lantern}.] 1. A light producing vessel, device, instrument or apparatus; formerly referring especially to a vessel with a wick used for… …   The Collaborative International Dictionary of English

  • Lamp burner — Lamp Lamp (l[a^]mp), n. [F. lampe, L. lampas, adis, fr. Gr. ?, ?, torch, fr. ? to give light, to shine. Cf. {Lampad}, {Lantern}.] 1. A light producing vessel, device, instrument or apparatus; formerly referring especially to a vessel with a wick… …   The Collaborative International Dictionary of English

  • Lamp fount — Lamp Lamp (l[a^]mp), n. [F. lampe, L. lampas, adis, fr. Gr. ?, ?, torch, fr. ? to give light, to shine. Cf. {Lampad}, {Lantern}.] 1. A light producing vessel, device, instrument or apparatus; formerly referring especially to a vessel with a wick… …   The Collaborative International Dictionary of English

  • Lamp jack — Lamp Lamp (l[a^]mp), n. [F. lampe, L. lampas, adis, fr. Gr. ?, ?, torch, fr. ? to give light, to shine. Cf. {Lampad}, {Lantern}.] 1. A light producing vessel, device, instrument or apparatus; formerly referring especially to a vessel with a wick… …   The Collaborative International Dictionary of English

  • Lamp shade — Lamp Lamp (l[a^]mp), n. [F. lampe, L. lampas, adis, fr. Gr. ?, ?, torch, fr. ? to give light, to shine. Cf. {Lampad}, {Lantern}.] 1. A light producing vessel, device, instrument or apparatus; formerly referring especially to a vessel with a wick… …   The Collaborative International Dictionary of English

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