EPIZOON 



437 



ERECTION 







Epizoon {ep-e-zo' -on) [hri, upon ; £wov, an animal : 

 pi. , Epizoa\. An animal living as a parasite upon 

 another ; an external parasite, as distinguished from 

 an Entozoon. 



Epizootic (cp-e-zo-ot'-ik) [i~i, upon; £wov, animal]. 

 I. Affecting the lower animals epidemically. 2. A con- 

 tagious, or generally prevalent disease affecting animals. 



Epizooty {ep-e-zo f -o-te) [e~i, upon ; £wov, animal]. An 

 epizootic disease. 



Eponychium (ep-o-nik / -e-um) [i~l, upon ; 6n\f , finger- 

 nail]. A horny condition of the epidermis from the 

 second to the eighth month of fetal life, indicating 

 the position of the future nail. 



Eponym (ep / -o-nim) [k-ui-vfioc, named after a person]. 

 A term derived from the name of a person. See 

 Table of Eponymic Diseases, under Disease. 



Epoophorectomy (ep-o-o-for-ek / -to-me) [eiruo<t>opov, 

 epoophoron ; ektout/, excision]. Surgical removal of 

 the epoophoron. 



Epoophoron {ep-o-off'-or-on) [coupon; wooopoc» lay- 

 ing eggs] . Same as Parovarium. 



Epostoma {ep-os-lo 1 '-mah) [eni, upon ; borcov, bone]. 

 An exostosis. 



Epsilon-bacillus. See Bacteria, Synonymatic Table of. 



Epsom Salts {ep'-sum). See Magnesium. 



Epstein's Dressing. A method of dressing the um- 

 bilical cord. It consists of the ordinary linen quad- 

 rangular belly-plastron with a central cap- like recepta- 

 cle for the umbilical stump. 



Epulis (ep-u'-lis) [eiri, upon ; nv/.a, the gums]. A hard, 

 fibrous tumor of the alveolar processes of the jaws. 



Epulosis (ep-u-lo'-sis) [h-ov/uGig : e~i, upon; ov'/.ij, 

 scar]. Cicatrization ; a cicatrix. 



Epulotic {ep-u-lof -ik ) [kiri, upon; ovli], scar]. I. 

 Promoting epulosis or cicatrization. 2. A remedy 

 or application that promotes the healing of wounds or 

 sores. 



Equation (e-kioa f -zhuri) [square, to make equal]. In 

 chemistry, a collection of symbols so arranged as to 

 indicate that if the bodies represented by the symbols 

 be brought together a chemic reaction will take place. 

 E., Personal, an allowance for individual peculiarity 

 or error in an observer's work, in order to render it 

 approximately accurate. 



uator [e-kwa'-tor) [square, to make equal]. An 

 imaginary circle surrounding a sphere. E. of a cell, 

 the boundary of the plane through which division takes 

 place. E. of the eye, the eequator oculi ; the 

 boundary of the transverse and central vertical plane 

 of the eye. E. of a Lens, the angular edge at the 

 meeting of the anterior and posterior surfaces of the 

 lens. 



uatorial (e-fcva-tor'-e-al) [square, to make equal]. 

 Pertaining or belonging to an equator. E. Plate. 

 See Karyokinesis and Plate. 



uilibration {e-que-lib-ra' -shun) [squilibrare, to bal- 

 ance equally]. Equipoise ; even balance. 

 Equilibrism (e-quil* '-ib-rkm) [squilibris, evenly bal- 

 anced]. The opinion that every voluntary act may be 

 counteracted by an opposing inhibitor}.' volition, 

 quilibrium {e-kii-e-lib' -re-um) [cequus, equal ; libra, 

 balance]. An even balancing of a body or condition. 

 E., Stable, when, after slight disturbance, the body 

 will return to its original condition or position. E., 

 Unstable, when it will not so return. 

 Equination (e-kwin-a' -shun) [equinus, of a horse]. I. 

 Inoculation with the virus of equine smallpox. 2. 

 Inoculation with the virus of equinia. 

 Equinia [e-kioin f -e-ah) [equus, a horse]. Glanders. 

 Farcy. A contagious, specific disease, with both local 

 and general symptoms, derived from the horse or ass. 

 It affects chiefly the skin, mucous membranes and 



lymphatics, and begins with a purulent nasal discharge, 

 the respirator) - , ocular and oral membranes being fur- 

 ther successively involved. It is of microbic origin. 

 See Bacillus mallei, in Bacteria, Synonymatic Table of. 

 Equinist (ek'-kwin-ist) [equus, a horse]. One who be- 

 lieves in the equine origin of a disease, e. g., of tetanus. 

 Equipollent [e-kwip'-o-lent) [aquus, equal ; pollere, to 

 be strong]. Of equal power or efficiency; said, for 

 example, of opposing muscles, or of parents in their 

 influence upon offspring. 

 Equisetum {ek-wis-e / -turn) [equus, a horse ; secta, bris- 

 tle]. A genus of cryptogamous plants ; the horse- 

 tails, or scouring rushes. E. hiemah and E. palustre, 

 of Europe and X. America, are reputed to be effective 

 and harmless diuretics. 

 Equitant (eh' '-wit-ant) [equitare, to ride]. In biology, 

 literally, riding. Applied to leaves, like those of the 

 iris, which are vertical and folded lengthwise, so that 

 each leaf, toward the base, overlaps or straddles the 

 next ; also applied to the longitudinally folded anten- 

 nae of certain insects. 

 Equivalence, Equivalency {e-kvonZ-al-ens, e-quiv'-al- 

 en-se) [aquus, equal ; valere, to be worth]. Equality 

 of valence ,or saturating-power. See Valence. In 

 chemistry, the property possessed by an element or 

 radical of combining with another element or radical 

 or of replacing it in a compound body in definite and 

 unalterable proportions. It is sometimes used as syno- 

 nymous with valence or quantivalence. 

 Equivalent {e-kzini/ -al-ent) [squus, equal ; valere, to 

 be worth]. Of equal valency. E. Focus. See 

 Focus. 

 Equivocal (e-kwiv* -o-kal) [squus,cqua\ ; vox, sound]. 



Of doubtful significance, as equivocal symptoms. 

 Eradication (e-rad-ik-a' -shun) [e, out ; radicare, to 



root]. Complete or thorough removal. 



Eradiculose (e-rad-ik'-u-los) [e, priv. ; radicula, a 



rootlet]. In biology, destitute of rootlets or rhizoids. 



Erasene (er'-as-en) [eradere, to scratch out ; from the 



power of erasing grease-spots]. A trade-name for 



California abietene. See Abietene. 



Erasion (era* -zhun) [e, out ; radere, to scrape]. The 



act of scraping or cureting. 

 Erb's Point. See Point. E. Reaction of degener- 

 ation. Deviation from the normal formula of muscu- 

 lar response to galvanism. E. " Upper-arm type " 

 of palsy. A myotrophy characterized by paralysis of 

 the deltoid and often of the supraspinatus and infra- 

 spinatus, the biceps, brachialis anticus, and the supin- 

 ators. See Diseases, Table of. 

 Erbium (ur'-be-um) [L.]. A rare element ; symbol 



Er. See Elements, Table of 

 Erdmann's Test. See Tests, Table of 

 Erdmann and Uslar's Test. See Tests, Table of. 

 Erect (e-rekt f ) [erectus, set up]. Upright; in the state 

 of erection. E. Posture. See Postures, Table of . 

 Erecthites (e-rek-thi' -tez) [ipexOinjc, groundsel]. A 

 genus of composite plants. E. hieracifolia. Fire- 

 weed ; a coarse composite-flowered plant common in 

 waste-lands in N. America ; it is astringent and tonic. 

 Unof. 

 Erectile (e-rek'-til) [erigere, to set up] . Pertaining to 

 or possessing the characteristic stiffening, rigidity, or 

 erection. E. Glossitis. See Glossitis, Parenchy- 

 matous. E. Tissue, that which is capable of erection ; 

 consisting of a network of expansile capillaries that 

 under stimulus becomes engorged with blood. 

 Erection (e-rek 1 '-shun) [etigere, to set up]. The con- 

 dition of temporary and functional fulness and firm- 

 ness of the penis, clitoris, etc., due to sexual excite- 

 ment, friction, etc.. the mechanism consisting in an 

 overfilling of the blood-vessels with inhibition of the 



