Phosphorus means Venus when it is seen in the morning (the morning star). Its name comes from the Greek name for the morning star (from the Greek phos, phosphorus means "bringer of light").
When named thus by the ancient Greeks, it was thought that Phosphorus and Hesperus (Venus in the evening) were two different celestial objects. It was the Greek philosopher and mathematician Pythagoras who first realized that Phosphorus and Hesperus were the same object.
The terms "Hesperus" and "Phosphorus" and the sentence "Hesperus is Phosphorus." are of interest to language philosophers. The terms were used by Frege to illustrate his idea of sense and reference. Kripke used the sentence to demonstrate that the knowledge of something necessary (in this case an identity) is not always an a priori matter, but could (and in some cases, necessarily) be something empirically discoverable.
Bologna phosphorus (Chem.), sulphide of barium, which shines in the dark after exposure to light; -- so called because this property was discovered by a resident of Bologna.
Phosphorus disease (Med.), a disease common among workers in phosphorus, giving rise to necrosis of the jawbone, and other symptoms.
Red, or Amorphous, phosphorus (Chem.), an allotropic modification of phosphorus, obtained as a dark red powder by heating ordinary phosphorus in closed vessels.
Phosphorus, (from the Greek language phôs meaning "light", and phoros meaning "bearer"), is the chemical element in the periodic table that has the symbol P and atomic number 15.
This is a particularly phosphorus uses poisonous element with 50 mg being the average fatal dose (white chemical properties phosphorusphosphorus is generally considered to be the lethal past uses for phosphorus form of phosphorus while phosphate and orthophosphate red phosphorus low phosphorus cat-food products model of a phosphorus atom are essential nutrients).
When phosphorus vs. zinc the white form is exposed to sunlight or when it is heated in its own vapor element phosphorus to 250 °C, it is transmuted to the red form, which does not properties of phosphorus phosphoresce in air.
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