METALLIFORM 



754 



METANIL-YELLOW 



is deprived of natural teeth, and is supplied with 

 an artificial Substitute. Gold and platinum are the 

 most suitable metals for this purpose, and those usually 

 employed by American dentists ; but silver is also very 

 frequently used. M. Taste, a peculiar taste observed 

 in certain diseases, and also after the ingestion of 

 some of the metallic poisons. M. Tinkling, the 

 peculiar quality given to a sound produced in 

 a cavity in a tuberculous lung, or in a pleural sac 

 containing a liquid exudate and a layer of air above 

 it. M. Tractors, the instruments used by Perkins in 

 his system of metallotherapy. See Perkinism. 



Metalliform (met-al' '-if-orm). See Metallic. 



Metalline (met' -al-en) [fiETa/Ckov , metal]. Consisting 

 of metal. 



Metallochymia (met-al-o-kim'-e-ah) [fikraYAov, metal ; 

 XVfieia, chemistry]. The chemistry of metals. 



Metallodynia (met-al-o-din' '-e-ah) [iiETa'h'kov , metal ; 

 bSvvi), pain]. Pain caused by metallic poisoning. 



Metalloid (met'-al-oid) [/zeraAAox>, metal; eUhg, form]. 

 I. Resembling a metal in luster and color. 2. Any 

 non-metallic element. 



Metallophagia (met- al '- o -fa' '-je - ah), Metallophagy 

 (met-al-off'-a-je) \jifra7Sx>v, metal; tyayelv, to eat]. 

 The insane impulse to swallow metallic objects. 



Metalloscopy (met-al-os' -ko-pe) [[ietojj.ov, a metal ; 

 okotteiv, to examine]. The art of determining by ex- 

 ternal application what metals or metallic substances 

 act most easily and favorably upon a given person. 

 See also Metallotherapy. 



Metallotherapy (met-al-o-ther'-ap-e) [uetcia/mv, metal; 

 depaneia, therapy], A method of treating certain 

 hysteric or paralytic affections by the application of 

 different metals to the affected part. There is usually a 

 transfer of the anesthesia or paralysis to the limb of the 

 other side. This method is called also Burcquism and 

 Metalloscopy. An old method of similar character 

 was called Perkinism. 



Metallotoxemia (met-al-o-toks-e'-me-ah) \jiETa'/!kov, 

 metal; to^ikov, poison; ai/ia, blood]. Toxemia, or 

 blood-poisoning, due to the ingestion of a metal. 



Metamere (met'-am-er) [fiera, after; fiepog, part]. 

 Any one of the theoretic segments of a vertebrate 

 animal. 



Metameric (met-am-er'-ik) [fiera, after ; /uepog, part]. 

 A qualification applied to isomeric bodies containing 

 several different carbon groups held in combination 

 by an atom of higher valence. 



Metamerid (met-am'-er-id) \_fiera, after; fJ.ipog, part]. 

 A group of metameric bodies ; usually applied to the 

 more complex metameric substances. 



Metamerism (met - am' '- er ■- izm) [//era, after ; /ufpog, a 

 part]. A change in the arrangement of the parts or 

 atoms of a chemic compound ; a form of isomerism. 



Metamethylphenol (met-am-eth-ilfe'-nol). Same as 

 Afetakresol. 



Metamorphia (met-am-or' -fe-ah). Synonym of Meta- 

 morpkin. 



Metamorphic (met-am-or' '-fik) [{ietcl, across; /topfir/, 

 form] . Pertaining to metamorphosis ; also synonymous 

 with metamorphous. 



Metamorphin (met-am-or' -fiii) [//era, beyond ; Mor- 

 pheus, the god of sleep]. An alkaloidal decomposi- 

 tion-product obtained from the mother-liquor of mor- 

 phin-manufacture. It is said to be narcotic and su- 

 dorific, but is little known and seldom used. Unof. 



Metamorphism (met-am-or' -fizm >. See Metamorphosis. 



Metamorphology (met-am-or-fol' '-o-je) [ue-aii6p<f>(jrr/r, 

 a transformation ; '/oyng, science]. In biology, the 

 science of the changes of form passed through by 

 individual organisms in the course of their life-his- 

 tories. 



Metamorphopsia (met-am-or- fop' -se-aH), Metamor- 

 phopsy (met-am-or' -fop-se) [fiETa/ioptyoeiv, to change 

 shape ; otpir , sight] . An apparent distortion or change 

 of form of objects, supposed to be produced by 

 changes in the relative position of the retinal end- 

 organs. 



Metamorphosing (met-am-or-fo' -zing) [fis-a/idpcpeiv, to 

 change shape]. Altering; changing. M. Breath- 

 sound, a variety of breathing related to the existence 

 of a cavity. It occurs only in inspiration, and consists 

 of a very harsh sound, which lasts for about one-third 

 of the period of inspiration, when it is continued as 

 blowing respiration, attended with metallic echo or 

 ordinary rales. It is produced by the air entering the 

 cavity through a narrow opening. 



Metamorphosis (met- am- or' -fo- sis) [/ietcl, across; 

 fioptyoEiv, to change] . A term denoting the structural 

 changes in form which all organisms undergo during 

 their development from the embryonic to the adult 

 stage. It is applied particularly to that form of sexual 

 reproduction in which the embryo undergoes a series 

 of marked changes of external form (e. g. , the chrys- 

 alis, the pupa-stage, etc.), and in none* of which 

 reproduction is possible until the sexually developed 

 form (the imago-stage of butterflies) is produced. In 

 pathology, a degeneration. M., Complete, in insects, 

 the three stages of metamorphosis, larva, pupa, imago. 

 M., Hemimetabolic, a metamorphosis in which the 

 succeeding stages do not differ much, although the first 

 and last stages may present great variations. M., 

 Holometabolic. See M., Complete. M., Regres- 

 sive, M., Retrograde, a disintegrating change ; a 

 degeneration ; also the change of an organ from a 

 higher to a lower type. M., Viscous, the agglu- 

 tination of blood-plaques and their conversion into a 

 thrombus. 



Metamorphous [met-am-or' -f us) [[ieto., across ; ftopf- 

 6eiv, to change]. Amorphous, but with a tendency to 

 crystallize. 



Metamorphy (met-am-or' -fe). Synonym of Metamor- 

 phosis. 



Metamylene (met-am'-il-en) [//era, across ; auv/ov, 

 starch], C 20 H W . A derivative of the polymers of 

 amylene, produced by heating amylic alcohol with sul- 

 phuric or phosphoric acid, or with zinc chlorid. 



Metanaphthalene (met-an-af ' -thal-en) [/zer«, beyond; 

 vd(f>0a, naphtha]. A decomposition-product obtained 

 by the destructive distillation of resin. It is isomeric 

 with naphthalene, and boils at 235 C. 



Metanaphthalin (met-an-af -thal-in) \jiErh, beyond; 

 vd(p8a, naphtha]. A solid hydrocarbon, insoluble in 

 water, soluble in hot alcohol, in ether, and in naphtha, 

 obtained in one stage of the dry distillation of a 

 resin. 



Metanauplius (met-an-aw' -ple-us) [//era, after ; nan- 

 plius ; vavc, a ship; ttXeiv, a sail: pi. , Metanaupm\. 

 In biology, a larval crustacean at a certain stage of 

 development. 



Metanephric (met-an-ef'-rik) \_/iE-a, after; VE<t>p6c, kid- j 

 ney]. Pertaining to the metanephros. 



Metanephros, Metanephron (met-an-ef '-ros, met-an- ■ 

 ef'-ron) [hetA, after; VEfypdc, kidney]. In bi*' 

 the kidney proper of vertebrates. The posterior ol the 

 three segmental bodies of the fetus; it forms 

 rudiment of the permanent kidney ami ureter. I 

 special portion of the Wolffian body, that devi 

 late, and only occurs in the amniota as a gland dis 

 tinct from the mesonephros. Cf. J\-v>i>; 

 tnphros. 



Metanil-yellow (mef'-an -il -vel'-o). Sodium -phenyl- 

 amido-benzol-meta-sulphonate ; a substance us< 

 counter-staining tissues. See Pigments, Cot 



