1. [syn: potassium, K, atomic number 19]
The Collaborative International Dictionary of English v.0.48:
Potassium \Po*tas"si*um\, n. [NL. See Potassa, Potash.]
An Alkali element, occurring abundantly but always combined,
as in the chloride, sulphate, carbonate, or silicate, in the
minerals sylvite, kainite, orthoclase, muscovite, etc. Atomic
weight 39.0. Symbol K (Kalium).
Note: It is reduced from the carbonate as a soft white metal,
lighter than water, which oxidizes with the greatest
readiness, and, to be preserved, must be kept under
liquid hydrocarbons, as naphtha or kerosene. Its
compounds are very important, being used in glass
making, soap making, in fertilizers, and in many drugs
Potassium permanganate, the salt KMnO4, crystallizing in
dark red prisms having a greenish surface color, and
dissolving in water with a beautiful purple red color; --
used as an oxidizer and disinfectant. The name chameleon
mineral is applied to this salt and also to potassium
Potassium bitartrate. See Cream of tartar, under Cream.
WordNet (r) 3.0 (2006):
n 1: a light soft silver-white metallic element of the alkali
metal group; oxidizes rapidly in air and reacts violently
with water; is abundant in nature in combined forms
occurring in sea water and in carnallite and kainite and
sylvite [syn: potassium, K, atomic number 19]
The Elements (07Nov00):
Atomic number: 19
Atomic weight: 39.0983
Soft silvery metallic element belonging to group 1 of the periodic table
(alkali metals). Occurs naturally in seawater and a many minerals.
reactive, chemically, it resembles sodium in its behavior and compounds.
Discovered by Sir Humphry Davy in 1807.