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English-Thai Dictionary

phosphorus

N ฟอสฟอรัส แร่ ฟอสฟอรัส fos-fo-ras

Webster's 1828 Dictionary

PHOSPHORUS, PHOSPHOR

n.[L. from the Greek. See Phosphor. ] 1. The morning star.
2. Phosphorus, in chimistry, a combustible substance, hitherto undecomposed. It is of a yellowish color and semi-transparent, resembling fine wax. It burns in common air with great rapidity; and in oxygen gas, with the greatest vehemence. Even at the common temperature, it combines with oxygen, undergoing a slow combustion and emitting a luminous vapor. It is originally obtained from urine; but it is now manufactured from bones, which consist of phosphate of lime.

Webster's 1913 Dictionary

PHOSPHORUS

Phos "phor *us, n.; pl. Phosphori. Etym: [L., the morning star, Gr.

1. The morning star; Phosphor.

2. (Chem. )

Defn: A poisonous nonmetallic element of the nitrogen group, obtained as a white, or yellowish, translucent waxy substance, having a characteristic disagreeable smell. It is very active chemically, must be preserved under water, and unites with oxygen even at ordinary temperatures, giving a faint glow, -- whence its name. It always occurs compined, usually in phosphates, as in the mineral apatite, in bones, etc. It is used in the composition on the tips of friction matches, and for many other purposes. The molecule contains four atoms. Symbol P. Atomic weight 31..

3. (Chem. )

Defn: Hence, any substance which shines in the dark like phosphorus, as certain phosphorescent bodies. 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. The term is sometimes applied to other compounds having similar properties. -- Metallic phosphorus (Chem. ), an allotropic modification of phosphorus, obtained as a gray metallic crystalline substance, having very inert chemical properties. It is obtained by heating ordinary phosphorus in a closed vessel at a high temperature. -- 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. It is not poisonous, is not phosphorescent, and is only moderately active chemically. It is valuable as a chemical reagent, and is used in the composition of the friction surface on which safety matches are ignited. -- Solar phosphori (Chem. ), phosphorescent substances which shine in the dark after exposure to the sunlight or other intense light.

PHOSPHORUS STEEL

PHOSPHORUS STEEL Phosphorus steel.

Defn: A steel in which the amount of phosphorus exceeds that of carbon.

New American Oxford Dictionary

phosphorus

phos pho rus |ˈfäsfərəs ˈfɑsf (ə )rəs | ▶noun the chemical element of atomic number 15, a poisonous, combustible nonmetal that exists in two common allotropic forms, white phosphorus, a yellowish waxy solid that ignites spontaneously in air and glows in the dark, and red phosphorus, a less reactive form used in making matches. (Symbol: P ) ORIGIN late 17th cent.: from Latin, from Greek phōsphoros, from phōs ‘light ’ + -phoros ‘-bringing. ’ usage: See usage at phosphorous .

Oxford Dictionary

phosphorus

phosphorus |ˈfɒsf (ə )rəs | ▶noun [ mass noun ] the chemical element of atomic number 15, a poisonous, combustible non-metal which exists in two common allotropic forms, white phosphorus, a yellowish waxy solid which ignites spontaneously in air and glows in the dark, and red phosphorus, a less reactive form used in making matches. (Symbol: P ) ORIGIN late 17th cent.: from Latin, from Greek phōsphoros, from phōs ‘light ’ + -phoros ‘-bringing ’.

Sanseido Wisdom Dictionary

phosphorus

phos pho rus /fɑ́sf (ə )rəs |fɔ́s -/名詞 U 〘化〙リン〘非金属元素; ｟記号｠P 〙.