EQUATORIAL 



119 



ERIOPHORTIM 



Equatorial, (e-kw5-to'ri-al). [Equator, q.v.] 

 A telescope so mounted that a star, &c., may 

 he followed by it from rising to setting : the 

 telescope moving regularly and continuously. 



Equi-, (e'kwi). [L. cequus, equal.] A prefix 

 meaning equal. 



Equidae, (e'kwi-de). [Equus, q.v.] Horse, 

 ass, zebra, &c. : a division of Ungulata, q.v. 



Equilateral, ( e-kwi-lat'er-al ). [L. cequus, 

 equal; latus, side.] Having 

 equal sides. 



Equilibrium, ( e - kwi - lib'ri - 

 um ). [L. cequus, equal ; 

 libra, balance.] - A state of 

 rest, arising from the equal- 

 ity of two opposite and equal 

 forces. Neutral E. : in which 

 a body may be moved with- 

 out either raising or lower- Equilateral, 

 ing its centre of gravity. Stable E.: when 

 the body, after a slight disturbance, would 

 return to its original position. Unstable E.'. 

 when a slight disturbance would suffice to 

 alter its position permanently by lowering 

 its centre of gravity. 



Equine, (S'kwln). [L. equus, horse.] Relating 

 to horses. 



Equinox, (e'kwi-noks), [JZquinoctium, the 

 Latin word. ] When day and night are equal 

 all over the world; when the' earth is at one 

 of the two points at which the equator and 

 ecliptic coincide. Vernal E.: 22nd March. 

 Autumnal E.: 22nd September. Spring E. 

 = Vernal E. 



Equinoctial, (e-qwi-noks'i-al). [Equi nox, q. v. ] 

 ^Celestial equator: the great circle of the 

 heavens lying in the plane of the earth's 

 equator. 



Equisetacese, (e-kwi-s5-ta'se-e). [L. equus, 

 horse; seta, hair .]=Horsetails: leafless aquatic 

 plants, in rivers and ditches, belonging to 

 Muscales. 



Equisetic acid, (e-kwi-se'tik). [Equisetum, 

 5.v.]=Aconitic acid, q.v. 



Equisetites, (e-qui-se'tltz or e-qwi-sa-ti'tez). 

 [Equisetacese, q.v.] Fossil plants in coal, 

 belonging to Equisetacese. 



Equisetum, (e-kwi-se'tum). [L. equus, horse; 

 seta, bristle.] The only genus of Equisetacese. 

 A marsh plant, found fossil in Lias rocks. 

 E. fl,uviatile=Cha.Ta.. 



Equivalency, (e-kwiv'a-len-sy). [Equivalent, 

 q.v.] In chemistry = Atomicity, q.v. 



Equivalent, (e-kwiv'a-lent). [L. cequus, equal; 

 valeo, I am strong.] The relative quantities 

 of substances which may be substituted for 

 one another in similar chemical compounds. 



Equivocal generation, ( e-kwiv'p-kal ). [L. 

 cequus, equal ; vocalis, speaking.] = Spon- 

 taneous generation, q.v. 



Equuleus, (e-kwi-ul'e-us). [The Latin name.] 

 =The Little Horse: a small northern con- 

 stellation. 



Equus, (e'kwu-us). [The Latin name.]= 

 Horse: a domesticated quadruped, belonging 

 to Equidse, q.v. **^' 



Eranthis, ( e-ran'this ). [Gk. eros, spring; 

 anthos, flower.]=. Winter aconite: a small 

 herb belonging to Kanunculacese. 



Eratosthenes, (er-a-tos'the-nez). [Classical.] 

 A lofty crater in the moon, 33 miles in 

 diameter, surrounded by mountains. 



Erbia, (er'bi-a). [Erbium, g.v.]=EO: the 

 oxide of erbium, a rare earth. 



Erbium, (ei- / bi-um).=E: very rare, one of the 

 earth-metals. 



Erdshrew, (erd'shru). [Gk. erd, earth; Shrew, 

 q.v.] Shrew-mouse, q.v. 



Eremacausis, (e-re-ma-kaw'sis). [Gk. eremos, 

 gently; kausis, burning.] Slow combustion, 

 such as rusting of iron, produced by the 

 action of the oxygen of the atmosphere. 



Erethizon, ( e-reth'i-zon ). [ Gk. erithizo, I 

 provoke.] E. dorsatum=Ca.nadia.n porcu- 

 pine. 



Erg', (erg). [Gk. ergon, work.] Proposed by 

 Everett as the unit of energy relative to the 

 foot, pound, and second. 



Ergot, (er'got), [The French word.] A black 

 fungoid body secreted within the floret of 

 grasses, especially of Rye=Puccinia gra- 

 in inis. 



Erian. Used by Dawson as equivalent to 

 Devonian. 



Erica, (e-ri'ka). [Erice, the Latin name.]= 

 Heath: a shrub, the type of Ericaceae, q.v. 



Ericaceae, (e-ri-ka'se-e). [Erica, 5. V. ^Heath- 

 worts: balsamic shrubs and trees, with 

 leathery leaves, belonging to Ericaies. 



Ericales, (e-ri-ka'l6z). [Erica, q.v.] Plants, 

 with dichlamydeous flowers, having an. 

 embryo with much fleshy albumen; forming 

 a division of Hypogynous Exogens. 



Ericinol, (e-ri'si-npl). [Erica, <?.v.]=CioH 16 0: 

 A green oil obtained from ericolin. 



Ericolin, (e-ri'ko-lin). [Erica, q.v.^C^H^^l' 

 A resinous substance obtained from erica- 

 ceous plants. 



Ericson's propeller. A variety of the screw- 

 propeller, in which a number of blades are 

 fitted on the surface of a hollow drum. 



Eridanus, ( e-rid'a-nus ). [Classical.] = The 

 river Eridanus: a southern constellation of 

 large size, but with few large stars, Acher- 

 nar being the chief. 



Erinaceidse, (e-rin-a'si-de). [Erinaceus, q.v.] 

 Owen's term for animals such as the hedge- 

 hog. 



Erinaceus, (e-rin-a'se-us). [The Latin name.] 

 =Hedgehog: an animal, belonging to Insec- 

 tivora, remarkable for having its back 

 covered with prickly spines. 



Erinite, (erl-nit). A mineral containing 

 copper. 



Eriocaulaceae, (e-ri-o-kaw-la'se-e). [Erio- 

 caulon, 2.v.]=Pipe-worts : marshy plants, 

 with small flowers, belonging to Glumales. 



Eriocaulon, (e-ri-o-kaw'lon). [Gk. erion, wool; 

 caulon, astem.]=Pipe-wort: a tropical plant 

 belonging to Eriocaulaceae, of which it is the 

 type. 



Eriometer, (e-ri-om'e-ter). [Gk. erion, wool; 

 metron, measure.] An apparatus for measur- 

 ing the diameter of fine fibres. 



Eriophorum, (e-ri-of'o-rum). [Gk. erion,wool; 

 phoreo, to bear. ]= Cotton-grass: herbs belong- 

 ing to CyperacesD, named from the cotton- 

 like fibres in the fruits. 



