ACEfOtf INE 



ACROCHORDTTS 



Acetonine, ( a-set'o-nm ). [ Acetone, q.v. ] 

 Acetonia=C 9 H 1 8N 2 : a colourless liquid alka- 

 line base ; obtained by action of ammonia 

 on acetone. 



Acetonitrile, ( a-se-to-m'tril ). [Acetic and 

 nitrogen, q.v.] C 2 H 3 N : a fragrant liquid 

 obtained from ammonic acetate. 

 Acetureide, (a-sGt'u-rid). [Acetyl and urea, 

 q.v.] C 3 HgN 2 2 urea in which one atom 

 of hydrogen is replaced by acetyl. 

 Acetyl, (as'e-til). [Acetic acid, q.v.] C 2 H 3 0: 

 the radicle of acetic acid. 

 Acetylene, (a-set'i-leu). [Acetyl, q.v.] C 2 H 2 = 

 Klumene=Ethine: an inflammable gas ob- 

 tained from marsh-gas, coal-gas, &c.; the 

 type of the acetylene series of hydrocarbons. 

 Acetylene series (a-set'i-len se'ri-ez) of hydro- 

 carbons, having the form CuH2n-2, of which 

 acetylene is the type. 



Acetylia, (a-se-tile-a). [Acetyl, q.v.] C^oNo 

 = Diethylenia = Diethylene dianiine : an 

 odorous inflammable oily liquid. 

 Achene, (a'ken). [Gk. a, not; ckaino, I 

 open] achenium: a small one-seeded fruit, 

 indehiscent. 



Achernar, (a-ker'nar)=a Eridani: the chief 

 star of the constellation Eridanus, of the 

 first magnitude, and one of the brightest in 

 the S. heavens. 



Achillea, (a-kil'le'a). [Achilles, the Greek war- 

 rior.] An herb, with yellow flower, of which 

 the yarrow and sneezewort are varieties. 

 AchiUeic acid, (a-kil'ik as'id), an acid found in 

 the plant Millefoil or Achillea Millefolium. 

 Achlamydeae, ( ak-la-mid'e-e ). [Gk. a, not; 

 chlamys, cloak.] Plants, of which the 

 flowers have neither calyx nor corolla; form 

 a sub-division of Apetalae. 

 Achlya, (a-kli'a). Common fly fungus: a 

 minute aquatic fungus, parasitic on fish and 

 dead flies, &c. ; a genus of Conferyacea;. 

 Achorion, (a-ko'ri-on). [Gk. chorion, exter- 

 nal skin.] A microscopic plant, found in the 

 human skin during the disease of/avus. 

 Achromatism, (ak-rom'a-tizm), refraction of 

 light without dispersion: correction of chro- 

 matic aberration, so that images formed by 

 lenses have no fringe of colour; also used for 

 correction of spherical aberration. 

 Achromatopsy, ( a-krom-a-top'si ). [Gk. a, 

 not ; chroma, colour ; opsis, sight] = Dal- 

 tonism=colour-disease: an ocular affection 

 which causes different colours to be more or 

 less confounded. 



Acids, (as'idz). [L. acidus, sharp.] Salts of 

 hydrogen: chemical compounds, of which 

 hydrogen isan essential constituent, differing 

 widely in composition and origin, usually 

 soluble in water, of sour taste, electro nega- 

 tive, and turning vegetable blue colour into 

 red; any of which readily form compounds 

 with other bodies. Hydrogenated bodies, 

 of which the hydrogen can readily be re- 

 placed by a metal. Monobasic organic acids 

 have one atom of oxygen in the radicle ; 

 dibasic organic acids two such atoms. 

 Acid-making metals, which form acid com- 

 pounds : antimony, arseuicum, bismuth, 

 molybdenum, niobium, tantalum, thori- 



num, tin, titanium, tungsten, ^vanadium, 

 zirconium. 

 Acid series, (as'id se'ri-ez). Acetic series= 



H 2 ii- 2 04; glycollic series=CnH 2 nO 3 . 

 Aclinic line, (a-klin'ik). [Gk. a, not; klinein, 



to incline.] Magnetic equator: an approxima- 



tion to a great circle of the earth, equidistant 



from the two magnetic poles, at any point of 



which the dipping needle remains horizontal. 



Aconite, (ak'6-nit)=Aconitum, q.v. 

 Aconitic acid, (a-kon-I'tik as'id). [Aconitum, 

 q.v.] CgHgOi}: an acid found in aconitum and 

 equisetum; also obtained from citric acid. 



Aconitine, (a-kon'i-tin). [Aconitum, q.v.]= 



Aconitin=C 3 oH47NO7:acrystalline poisonous 

 alkaloid substance obtained from m onkshood. 



Aconitum, (a-kon-i'tum). [Gk, akoniton,from; 

 akon, a small spear.] Monkshood = wolf's 

 bane: a common hardy very poisonous herb, 

 with pointed leaves, belonging to Ranun- 

 culaceae. 



Aconityl, (ak-o-m'til). [Aconite, q.v.] C 6 H 3 O 3 : 

 the radicle of aconitic acid. 



Acontia ( a-kon'ti-a ). [Gk. alcon, a small 

 spear.] Bunches of white cord, full of lasso- 

 cells, found in Actiniae, by means of which 

 they kill their prey. 



Acontias, (a-kon'ti-as), [The Greek name.] 

 A small serpent, having no poison fangs, 

 and feeding on insects, connecting snakes 

 and serpents by resembling each. 



Acorn shells, (a'korn shelz). [Name from the 

 shape.] Small crustaceous animals found on, 

 shores below high-water mark=Balanidse. 



Acorus, (a'ko-rus). [Gk. akoron.] Sweet flag- 

 =Sweet sedge: a poisonous herb belonging to 

 Orontiaceae. 



Acotyledons, (a-kot-il-e'donz). [Gk. a, with- 

 out; kotyledon, seed-lobe.] Cryptogam ia= 

 Cellulares. Plants having neither seed- 

 leaves nor flowers, almost wholly of cellular 

 tissue, reproduced by spores; divided into 

 Vasculares and Cellulares. 



Acoustics, (a-kous'tiks). [Gk. akoustos, audi- 

 ble.] The science of sound, including the 

 vibrations of elastic bodies which give 

 sounds. 



Acraldehyd, (a-kral'de-hid). [Acer and alde- 

 hyd, q.v.] C^jHgOa: a form of aldehyd, a 

 liquid obtained frotn glycol. 



Acraspedote medusae, (a-kras'pe-dot me-du'se). 

 [Gk. a, not; kraspcdo, to border.] Stegan- 

 ophthalmous medusae; medusae having no 

 velum or border to the swimming bell. 



Acridine, (ak'ri-dm). [L. acer, sharp.] 

 C 12 H 9 N: a crystalline base obtained from 

 anthracene, which causes sneezing and 

 coughing when inhaled in dust or vapour. 



Acrita, (ak'ri-ta). [Gk. akritos, indistinct.] 

 Protozoa, &c.: animals of a low and indis- 

 tinct organization. 



Acrobates, (ak-ro'ba-tez). [Gk. akros, point; 

 bao, I walk.] Insectivorous marsupial ani- 

 mals, walking on .the tips of the toes. 



Acrochordus, (ak-ro-kor'dus). Gk. akros, end; 

 chorde, string.] Harmless serpents. 



