Phorone Phor"one noun [ Cam
phor + acet
one .]
(Chemistry) A yellow crystalline substance, having a geraniumlike odor, regarded as a complex derivative of acetone, and obtained from certain camphor compounds.
Phoronis Pho·ro"nis noun [ New Latin , from Latin
Phoronis , a surname of Io, Greek ....]
(Zoology) A remarkable genus of marine worms having tentacles around the mouth. It is usually classed with the gephyreans. Its larva ( Actinotrocha ) undergoes a peculiar metamorphosis.
Phoronomia Phor`o·no"mi·a noun [ New Latin ]
See Phoronomics .
Phoronomics Phor`o·nom"ics noun [ Greek ... a carrying, motion + ... a law.]
The science of motion; kinematics. [ R.]
Weisbach.
Phosgene Phos"gene adjective [ Greek ... light + the root of ... to be born: confer French
phosgène .]
(Old Chem.) Producing, or produced by, the action of light; -- formerly used specifically to designate a gas now called carbonyl chloride . See Carbonyl .
Phosgenite Phos"gen·ite noun (Min.) A rare mineral occurring in tetragonal crystals of a white, yellow, or grayish color and adamantine luster. It is a chlorocarbonate of lead.
Phospham Phos"pham noun [
Phosph orus +
am monia.]
(Chemistry) An inert amorphous white powder, PN 2 H, obtained by passing ammonia over heated phosphorus. [ Spelt also
phosphame .] --
Phos"pham"ic adjective
Phosphate Phos"phate noun (Chemistry) A salt of phosphoric acid.
Phosphatic Phos·phat"ic adjective (Chemistry) Pertaining to, or containing, phosphorus, phosphoric acid, or phosphates; as, phosphatic nodules. Phosphatic diathesis (Medicine) ,
a habit of body which leads to the undue excretion of phosphates with the urine.
Phosphaturia Phos`pha·tu"ri·a noun [ New Latin See
Phosphate , and
Urine .]
(Medicine) The excessive discharge of phosphates in the urine.
Phosphene Phos"phene noun [ Greek ... light + ... to show.]
(Physiol.) A luminous impression produced through excitation of the retina by some cause other than the impingement upon it of rays of light, as by pressure upon the eyeball when the lids are closed. Confer After-image .
Phosphide Phos"phide noun (Chemistry) A binary compound of phosphorus.
Phosphine Phos"phine noun (Chemistry) A colorless gas, PH 3 , analogous to ammonia, and having a disagreeable odor resembling that of garlic. Called also hydrogen phosphide , and formerly, phosphureted hydrogen . » It is the most important compound of phosphorus and hydrogen, and is produced by the action of caustic potash on phosphorus. It is spontaneously inflammable, owing to impurities, and in burning produces peculiar vortical rings of smoke.
Phosphine Phos"phine noun (Dyeing) Chrysaniline, often in the form of a salt.
Phosphinic Phos·phin"ic adjective (Chemistry) Pertaining to, or designating, certain acids analogous to the phosphonic acids, but containing two hydrocarbon radicals, and derived from the secondary phosphines by oxidation.
Phosphite Phos"phite noun (Chemistry) A salt of phosphorous acid.
Phosphonic Phos·phon"ic adjective [
Phosph oric + sulph
onic .]
(Chemistry) Pertaining to, or designating, certain derivatives of phosphorous acid containing a hydrocarbon radical, and analogous to the sulphonic acid.
Phosphonium Phos·pho"ni·um noun [
Phosph orus + amm
onium .]
(Chemistry) The hypothetical radical PH 4 , analogous to ammonium, and regarded as the nucleus of certain derivatives of phosphine.
Phosphor Phos"phor noun [ Confer German
phosphor . See
Phosphorus .]
1. Phosphorus. [ Obsolete]
Addison. 2. The planet Venus, when appearing as the morning star; Lucifer. [ Poetic]
Pope. Tennyson.
Phosphor-bronze Phos"phor-bronze` noun [
Phosphor +
bronze .]
(Metal.) A variety of bronze possessing great hardness, elasticity, and toughness, obtained by melting copper with tin phosphide. It contains one or two per cent of phosphorus and from five to fifteen per cent of tin.
Phosphorate Phos"phor·ate transitive verb [
imperfect & past participle Phosphorated ;
present participle & verbal noun Phosphorating .]
(Chemistry) To impregnate, or combine, with phosphorus or its compounds; as, phosphorated oil.
Phosphoreous Phos·pho"re·ous adjective Phosphorescent. [ Obsolete]
Phosphoresce Phos`phor·esce" intransitive verb [
imperfect & past participle Phosphoresced ;
present participle & verbal noun Phosphorescing .]
To shine as phosphorus; to be phosphorescent; to emit a phosphoric light.
Phosphorescence Phos`phor·es"cence noun [ Confer French
phosphorescence .]
1. The quality or state of being phosphorescent; or the act of phosphorescing. 2. A phosphoric light.
Phosphorescent Phos`phor·es"cent adjective [ Confer French
phosphorescent .]
Shining with a phosphoric light; luminous without sensible heat. --
noun A phosphorescent substance.
Phosphoric Phos·phor"ic adjective [ Confer French
phosphorique .]
1. (Chemistry) Of or pertaining to phosphorus; resembling, or containing, from us; specifically, designating those compounds in which phosphorus has a higher valence as contrasted with the phosphorous compounds. 2. Phosphorescent. "A
phosphoric sea."
Byron. Glacial phosphoric acid .
(Chemistry) (a) Metaphosphoric acid in the form of glassy semitransparent masses or sticks .
(b) Pure normal phosphoric acid. --
Phosphoric acid (Chemistry) ,
a white crystalline substance, H 3 PO 4 , which is the most highly oxidized acid of phosphorus, and forms an important and extensive series of compounds, viz., the phosphates. --
Soluble phosphoric acid ,
Insoluble phosphoric acid (Agric. Chem.) ,
phosphoric acid combined in acid salts, or in neutral or basic salts, which are respectively soluble and insoluble in water or in plant juices. --
Reverted phosphoric acid (Agric. Chem.) ,
phosphoric acid changed from acid (soluble) salts back to neutral or basic (insoluble) salts.
Phosphorical Phos·phor"ic·al adjective (Old Chem.) Phosphoric.
Phosphorite Phos"phor·ite noun (Min.) A massive variety of apatite.
Phosphoritic Phos`phor·it"ic adjective (Min.) Pertaining to phosphorite; resembling, or of the nature of, phosphorite.
Phosphorize Phos"phor·ize transitive verb To phosphorate.
Phosphorized Phos"phor·ized adjective Containing, or impregnated with, phosphorus.
Phosphorogenic Phos`phor·o·gen"ic adjective [
Phosphorus +
-gen +
-ic .]
Generating phosphorescence; as, phosphorogenic rays.
Phosphoroscope Phos·phor"o·scope noun [
Phosphorus +
-scope .]
(Physics) An apparatus for observing the phosphorescence produced in different bodies by the action of light, and for measuring its duration.
Phosphorous Phos"phor·ous adjective [ Confer French
phosphoreux .]
(Chemistry) Of or pertaining to phosphorus; resembling or containing phosphorus; specifically, designating those compounds in which phosphorus has a lower valence as contrasted with phosphoric compounds; as, phosphorous acid, H 3 PO 3 .
Phosphorus Phos"phor·us noun ;
plural Phosphori . [ Latin , the morning star, Greek ..., lit., light bringer; ... light + ... to bring.]
1. The morning star; Phosphor. 2. (Chemistry) 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 31.0. 3. (Chemistry) Hence, any substance which shines in the dark like phosphorus, as certain phosphorescent bodies. Bologna phosphorus (Chemistry) ,
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 (Chemistry) ,
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 (Medicine) ,
a disease common among workers in phosphorus, giving rise to necrosis of the jawbone, and other symptoms. --
Red, or Amorphous ,
phosphorus (Chemistry) ,
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 (Chemistry) ,
phosphorescent substances which shine in the dark after exposure to the sunlight or other intense light.
Phosphorus steel Phosphorus steel A steel in which the amount of phosphorus exceeds that of carbon.
Phosphoryl Phos"phor·yl noun [
Phosphor us +
-yl .]
(Chemistry) The radical PO, regarded as the typical nucleus of certain compounds.
Phosphuret Phos"phu·ret noun (Chemistry) A phosphide. [ Obsoles.]
Phosphureted Phos"phu·ret`ed adjective (Chemistry) Impregnated, or combined, with phosphorus. [ Obsoles.] [ Written also
phosphuretted .]
Phosphureted hydrogen .
(Chemistry) See Phosphine .
Photic Pho"tic adjective [ Greek
fw^s ,
fwto`s , light.]
(Physiol.) Relating to the production of light by the lower animals.
Photic Pho"tic adjective [ Greek ..., ..., light.]
Of or pert. to light; specif., relating to the production of light by the lower animals.
Photic region Photic region (Phytogeography) The uppermost zone of the sea, which receives the most light.
Photics Pho"tics noun (Physics) The science of light; -- a general term sometimes employed when optics is restricted to light as a producing vision. Knight.
Photism Pho"tism noun [ Greek ... illumination.]
(Psycol.) A luminous image or appearance of a hallucinatory character.
Photo Pho"to noun ;
plural Photos A contraction of Photograph . [ Colloq.]
Photo- Pho"to- A combining form from Greek fw^s , fwto`s , light ; as, photo graphy, photo type, photo meter.
Photo-electric Pho`to-e·lec"tric adjective [
Photo- +
electric .]
Acting by the operation of both light and electricity; -- said of apparatus for producing pictures by electric light.
Photo-electric cell Photo-electric cell A cell (as one of two electrodes embedded in selenium) which by exposure to light generates an electric current.
Photo-electric, Photo-electrical Pho`to-e·lec"tric, Pho`to-e·lec"tric·al adjective Pert. to, or capable of developing, photo- electricity.
Photo-electricity Pho`to-e·lec·tric"i·ty noun [
Photo- +
electricity .]
Electricity produced by light.
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