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in small quantities with steel, it greatly increases its hardness. Symbol W (Wolframium). Atomic weight, 183.6. Specific gravity, 18.

uding Turnix and allied genera, resembling quails in appearance but differing from them anatomically.

d partridges in general appearance and in some of their habits, but differ in important anatomical characteristics. The hind toe is usually lacking. They are found in Asia, Africa, Southern Europe, the East Indian Islands, and esp. in Australia and adjacent islands, where they are called quails (see Quail, n., 3.). See…

A combining form used in anatomy to indicate connection with, or relation to, the tympanum; as in tympanohyal, tympano-Eustachian.

of the methane series, found in petroleum; -- so called from its containing eleven carbon atoms in the molecule.

A salt of orthosilicic acid, H4SiO4; -- so called because the ratio of the oxygen atoms united to the basic metals and silicon respectively is 1:1; for example, Mg2SiO4 or 2MgO.SiO2.

Having a valence of one; capable of combining with, or of being substituted for, one atom of hydrogen; monovalent; -- said of certain atoms and radicals.

Being without symmetry of chemical structure or relation; as, an unsymmetrical carbon atom. Unsymmetrical carbon atom (Chem.), one which is united at once to four different atoms or radicals. This condition usually occasions physical isomerism, with the attendant action on polarized light.

g fluorescence, and its black oxide is used as a pigment in porcelain painting. Symbol U. Atomic weight 239.

olds the doctrine that the space between the bodies of the universe, or the molecules and atoms of matter., is a vacuum; -- opposed to plenist.

The degree of combining power of an atom (or radical) as shown by the number of atoms of hydrogen (or of other monads, as chlorine, sodium, etc.) with which it will combine, or for which it can be substituted, or with which it can be compared; thus, an atom of hydrogen is a monad, and has a valence of one; the atoms of…

Of or pertaining to Valsalva, an Italian anatomist of the 17th century. Valsalvian experiment (Med.), the process of inflating the middle ear by closing the mouth and nostrils, and blowing so as to puff out the cheeks.

One of the two similar portions of the shell of a diatom.

tals and the non-metals, having both basic and acid properties. Sumbol V (or Vd, rarely). Atomic weight 51.2.

A combining form used in anatomy to indicate connection with, or relation to, the abdomen; also, connection with, relation to, or direction toward, the ventral side; as, ventrolateral; ventro- inguinal.

A combining form used in anatomy to indicate connection with, or relation to, a vertebra, vertebræ, or vertebral column; as in vertebrocostal.

A combining form used in anatomy to indicate connection with, or relation to, the bla; as in vesicoprostatic, vesicovaginal.

An odometer; -- called also viatometer.

Amount, fullness, quantity, or caliber of voice or tone. Atomic volume, Molecular volume (Chem.), the ratio of the atomic and molecular weights divided respectively by the specific gravity of the substance in question. -- Specific volume (Physics & Chem.), the quotient obtained by dividing unity by the specific gravit…

l Turbellaria belonging to Vortex and allied genera. See Illustration in Appendix. Vortex atom (Chem.), a hypothetical ring-shaped mass of elementary matter in continuous vortical motion. It is conveniently regarded in certain mathematical speculations as the typical form and structure of the chemical atom. -- Vortex…