• WordNet 3.6
    • n osmium a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
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Webster's Revised Unabridged Dictionary
  • Interesting fact: The densest substance on Earth is the metal "osmium."
    • n osmium ŏz"mĭ*ŭm (Chem) A rare metallic element of the platinum group with atomic number 76. It is found native as an alloy in platinum ore, and in iridosmine. It is a hard, infusible, bluish or grayish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol Os. Atomic weight 190.2. Specific gravity 22.477.
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Century Dictionary and Cyclopedia
    • n osmium Chemical symbol, Os; atomic weight, 191. One of the metals of the platina group. It does not occur native, but has been found to constitute a part of the native platina of all the platiniferous regions (South America, California, Australia, Russia), in the form of iridosmium, an alloy of the metals osmium and iridium. The specific gravity of the artificially obtained metal has been found to be 22.477; hence it is the heaviest of those bodies. It has never been fused. Its crystalline form is either that of the cube or that of a very obtuse rhombohedron. The crystals are of a bluish-white color, with a violet luster, and are harder than glass. Osmium is not used in the arts, except in the form of iridosmium, of which material the tips of gold pens are made.
    • n osmium This, the most refractory of the metals, has, though with difficulty, been completely fused into globules by means of the electric furnace.
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Chambers's Twentieth Century Dictionary
    • n Osmium ōs′mi-um a gray-coloured metal found in platinum ore, the oxide of which has a disagreeable smell
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Webster's Revised Unabridged Dictionary
Gr. 'osmh` a smell, odor, akin to 'o`zein to smell. So named in allusion to the strong chlorinelike odor of osmic tetroxide. See Odor
Chambers's Twentieth Century Dictionary
Gr. osmē, smell, orig. od-mēozein, to smell.


In literature:

A great variety of methods for coating incandescent lamp filaments with silicon, titanium, chromium, osmium, boron, etc.
"Edison, His Life and Inventions" by Frank Lewis Dyer and Thomas Commerford Martin
The metals platinum, iridium, rhodium, osmium and palladium do not fuse.
"A System of Instruction in the Practical Use of the Blowpipe" by Anonymous
OSMIUM (Plate XVIII, 4).
"Occult Chemistry" by Annie Besant and Charles W. Leadbeater
The points of our gold pens are tipped with an osmium-iridium alloy.
"Creative Chemistry" by Edwin E. Slosson
The tantalum filament was quickly followed by osmium and by tungsten in this country.
"Artificial Light" by M. Luckiesh
I tried to get him to work on the iridium-osmium problem, but he refused.
"The Skylark of Space" by Edward Elmer Smith and Lee Hawkins Garby
Osmium 187 was stable, but it wasn't a normally used step toward Mercury 203.
"The Bramble Bush" by Gordon Randall Garrett
He then fused iridium, the alloy of iridium and osmium, and other refractory substances.
"Fragments of science, V. 1-2" by John Tyndall
But the osmium and uranium alloyed with it are something else.
"The Planet Strappers" by Raymond Zinke Gallun
He saw neat stacks of gold ingots, new, freshly smelted; bars of silver-white iridium, of argent platinum, of blue-white osmium.
"Salvage in Space" by John Stewart Williamson

In news:

Platinum, palladium, rhodium, ruthenium, gold, silver and osmium).

In science:

Much larger enantiomer shifts, in the range of several Hz, have recently been predicted for some rhenium and osmium complexes and these may be observable using supersonic beams.
Preparation and manipulation of molecules for fundamental physics tests
Fast neutrons were produced by the bombardment of beryllium with 28 MeV deuterons in the synchrocyclotron. 189W was produced via the (n,α ) reaction on an osmium target.
Discovery of the Tungsten Isotopes
For the three osmium isotopes mentioned above we have Ω = 280 − 315 keV.
Theory of rapid (nonadiabatic) rotation of nonspherical nuclei
The greatest discrepancy occurs in the case of osmium.
Theory of rapid (nonadiabatic) rotation of nonspherical nuclei
Possibly this is in some way associated with the closeness of osmium to the point of phase transition of nonspherical nuclei into spherical ones (cf., also the striking anomalies at the beginning and at the end of Table 1).
Theory of rapid (nonadiabatic) rotation of nonspherical nuclei