ATHEROMATOUS 



146' 



ATRACTYLIS 



Atheromatous {ath-er-o' -mat-us) [adijpuua, an athero- 

 matous tumor]. Characterized by or affected with 

 atheroma. 



Atherosperma [ath-er-o-sper f -mah) \a(n)p, beard ; 

 OTitpfia, seed]. A genus of trees. A. moschatum, 

 Australian sassafras, a diaphoretic and diuretic some- 

 times used in pulmonary affections and asthma. Dose 

 of the tincture, 3ss-j. Unof. 



Athetoid (ath' -et-oid) \hB-qroq, unfixed]. Pertaining to 

 or affected with athetosis. A. Spasm, a symptom of 

 hemiplegia and some cerebral lesions. 



Athetosis {ath-et-o'-sis) [dfl^roc, unfixed ; changeable] . 

 A symptom most frequently occurring in children, and 

 characterized by continual change of position of the 

 fingers and toes, and inability to keep them still, save in 

 sleep. It is due to some lesion or derangement of 

 the brain or cord. It is also called " post-hemiplegic 

 chorea," from its occurrence after hemiplegia, in 

 adults. A., Double Congenital. See Paraplegia, 

 Infantile Spasmodic ; also Double Athetosis. 



Athlete (ath-lef) [d#ZeZv, to contend with]. Robust ; 

 vigorous. A.'s Heart, incompetency of the aortic 

 valves, a condition frequently found in athletes. 



Athletics (ath-let f -iks) [adAeiv, to contend]. The art 

 of physical exercise for development or for health. 



Athrepsia (ah-threps' '-e-ak) [dpriv ; rptyeiv, to nourish]. 

 The symptom-complex resulting from imperfect nutri- 

 tion in children. 



Athroisemia (ath-roi-se / -me-ah) [adpoiojia, accumula- 

 tion ; alfia, blood] . Congestion or accumulation of 

 blood. 



Athymia (ah-thi' -me-ali) [d priv. ; dv/nog, mind]. I. 

 Despondency. 2. Loss of consciousness. 3. Insanity. 



Athymic (ah-thi'-mik) [d priv. ; 0'vfwq, mind]. Affected 

 with athymia. 



Atlantad [at-lan' -tad) [" Ar?.ar, a Greek hero] . Toward 

 the atlas in situation or direction. 



Atlantal [at- Ian' '-tal) ["Ar/lac, a Greek hero]. Relating 

 to the atlas. 



Atlanten [at-lan f -ten) ["ArZac, a Greek hero]. Belong- 

 ing to the atlas in itself. 



Atlanti-obliquus (at-lan' '-ti-ob-li' '-kwus) [L.]. The 

 obliquus capitis superior muscle. 



Atlanti-rectus (at-lan' -ti-rek' -tus) [L.]. The muscle 

 called rectus capitis posticus minor. 



Atlanto- (at-lan'-to) ["ArPiac, a Greek hero]. A prefix 

 signifying relation to the atlas ; seen in the words 

 Atlanto-axial, (relating to the atlas and the axis) Atlan- 

 to-occipital, Atlanto-odontoid , etc. 



Atlas (at'-las) [drAac, able]. The uppermost of the 

 cervical vertebrae. It articulates with the occipital bone 

 of the skull. A. Silk. See Sill-. 



Atlee's Operation. See Operations, Table of. 



Atlodidymus (at-lo-did'-im-us). Same as Atlodymus. 



Atlodymus (at-lod' -im-us) [_o.t7m<;, able ; dlfivfiog, 

 double]. A monosomic dual monstrosity; with two 

 heads and a single body. 



Atloido- (at-loi f -dd) [«t/.<ic , able] . In composition, the 

 same as atlanto; seen in such examples as atloido- 

 axoid, atloido-odontoid, etc. 



Atmiatry {at-mi'-at-re) [dr///c, vapor ; laTpeia, medical 

 treatment]. Treatment of diseases of the lungs or 

 mucous membranes, by inhalation, fumigation, or by 

 directing a current of vapor or gas upon the part. 



Atmid-albumose (at-mid-al'-bu-mbs) [dr///r, vapor; 

 albumen']. Neumcister's term for the albumose formed 

 by the action of superheated steam. 



Atmidometer (at-mid-om'-et-er). See Atmotneter. 



Atmidoscope (al-mid'-o-skop) [urtiir, vapor; (Tiamelv, 

 to view] . See Atmometer . 



Atmograph (at'-mo-graf) [arfi6q, breath ; ypft<f>Fiv, to 

 record]. A form of self-registering respirameter. 



Atmometer, or Atmidometer (at-mom'-et-er ; at-viid- 

 om'-et-er) [dr/z/c, vapor; fierpov, a measure]. An in- 

 strument to measure the amount of water exhaled 

 from a given surface in a given time, in order to deter- 

 mine the humidity of the atmosphere. 



Atmosphere [at' '-mos-fer) [arpog, vapor; G<f>aipa, a 

 sphere]. The mixture of gases, vapor of water, and 

 other suspended matters, surrounding the earth, as an 

 elastic fluid envelop, to the height of about 200 

 miles. 



Atmospheric (at-mos-fer' '-ik) [arfiog, vapor; ofyajpa, a 

 sphere]. Pertaining to the atmosphere. A. Moisture, 

 the vapor of water mingled with the atmosphere. It 

 varies in quantity according to the temperature. A. 

 Pressure Cavity, a cavity formed on the palatine sur- 

 face of a set of artificial teeth to retain them in the 

 mouth. A. Tension, the pressure of the air per 

 square inch on the surface of a body. Normally, at 

 the sea level it is about 14.7 lbs. per square inch, or 

 equal to that of a column of mercury about 30 in. in 

 height. It decreases about y 1 ^ in., or ^ ft), per square 

 inch for every 90 feet of altitude. Above 10,000 feet, 

 the rarity of the atmosphere is usually noticeable in 

 quickened breathing and pulse rate. 



Atocia (at-o r -se-ah) [<itokoc, barren]. Sterility of the 

 female. 



Atom (at' -urn) [d priv. ; te/ivelv, to cut]. The ulti- 

 mate unit of an element ; that part of a substance 

 incapable of further division, or the smallest part 

 capable of entering a chemical compound, or uniting 

 with another to form a Molecule — which last is the 

 smallest quantity of a substance that can exist free or 

 uncombined. See Elements, Table of. 



Atomic (at-otn'-ik) [d priv.; te/ivelv, to cut]. Of or 

 pertaining to atoms. A. Heat of an atom is its 

 specific heat multiplied by its atomic weight. A. 

 Theory, the theory of Dalton, that all matter is com- 

 posed of atoms, the weight of each atom differing for 

 the different substances. A. Valence, Equivalence, 

 or the Atomicity of an element, is the saturating 

 power of its atom as compared with that of hydrogen. 

 A. Weight, the weight of an atom of an element as 

 compared with the weight of an atom of hydrogen. 



Atomicity (at-om-is'-it-e) [d priv.; te/iveiv, to cut]. 

 Chemical valence ; quantivalence. 



Atomization (at-om-iz-a' -shun) [d priv. ; te/ivelv, to 

 cut] . The mechanical process of breaking up a liquid 

 into fine spray. 



Atomizer (at'-om-i-zer) [d priv. ; rifivEiv, to cut] . An 

 instrument for transforming a liquid into a spray ot 

 mist. 



Atonia (at-o f -ne-ah) [a-ovia, want of tone]. Atony. 



Atonic (at-on'-ik) \a-ovia, want of tone] . Relating to. 

 or characterized by, atony. 



Atony (at'-o-ne) [d priv. ; rdvog, tone]. Want of tone. 

 Debility. Loss or diminution of muscular or vital 

 energy. 



Atopomenorrhea (al-o-fo-men-or-e'-ah) [dro7rof, out of 

 place; pr/v, month ; pisiv, to flow]. Vicarious men- 

 struation. 



Atoxic (ah-toks'-ik) [d priv. ; to!-ik6v, poison]. Not 

 venomous ; not poisonous. 



Atrabiliary {at-rah-bil'-c-a-rr) \ater, black ; bills, bile]. 

 An obsolescent term relating to melancholy and hypo- 

 chondriasis ; also referring to the renal and supra renal 

 glands, once believed to produce black bile, or atra- 

 bilis, the cause of the gloomy disposition. A., 

 Capsules, an old name for the supra-renal capsules. 



Atractylis (at-rak'-til-is) [drpaKrtvU'c]. A genus of 

 composite-flowered plants, nearly related to the saf- 

 fuwer {Carthamus), A. gummifera, of the Mediter- 

 ranean region, affords Qcafttkomastic, A. lancea, of 



