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y weight and about 21 per cent by volume, being slightly heavier than nitrogen. Symbol O. Atomic weight 15.96.

cluding the kamichi, and allied South American birds; -- called also screamers. In many anatomical characters they are allied to the Anseres, but they externally resemble the wading birds.

A combining form used in anatomy to indicate relation to, or connection with, the palate; as in palatolingual.

d in 1804 by Wollaston from the asteroid Pallas, which was discovered in 1802. Symbol Pd. Atomic weight, 106.2.

A minute part or portion of matter; a morsel; a little bit; an atom; a jot; as, a particle of sand, of wood, of dust. The small size of atoms which unite To make the smallest particle of light. Blackmore.

Capable of uniting with five molecules of a monacid base; having five acid hydrogen atoms capable of substitution by a basic radical; -- said of certain acids.

A chloride having five atoms of chlorine in each molecule.

neutralizing, or combining with, five molecules of a monobasic acid; having five hydrogen atoms capable of substitution by acid residues; -- said of certain complex bases.

Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds.

, tar oil, etc., and obtained as a colorless liquid; -- so called from the fifteen carbon atoms in the molecule.

, volatile liquids, two of which occur in petroleum. So called because of the five carbon atoms in the molecule.

drogen sulphide into a solution of sulphur dioxide; -- so called because it contains five atoms of sulphur.

Having a valence of five; -- said of certain atoms and radicals.

a group of sugars of the formula C5H10O5, as arabinose; -- so called from the five carbon atoms in the molecule. They are not fermented by yeast.

An oxide containing five atoms of oxygen in each molecule; as, phosphorus pentoxide, P2O5.

A branch of anatomy which treats of the veins.

on the tips of friction matches, and for many other purposes. The molecule contains four atoms. Symbol P. Atomic weight 31.0.

The dissection of plants; vegetable anatomy.

of any plane figure, however irregular, by passing a tracer around the bounding line; a platometer.

rely for coin, and in the form of foil and wire for many purposes. Specific gravity 21.5. Atomic weight 194.3. Symbol Pt. Formerly called platina. Platinum black (Chem.), a soft, dull black powder, consisting of finely divided metallic platinum obtained by reduction and precipitation from its solutions. It absorbs oxyg…