ATHEBICEBA 



ATT WOOD'S 



Atlantes. 



Athericera, (a-ther-is'er-a). [Gk. cither, point; 

 keras, horn.] A group of insects belonging 

 to Diptera. 



Atherina, (a-ther-i'na). Atherine: a fish, be- 

 longing to Abdominales. A. presbyter = 

 Atherine=Sandsmelt. 



Athermancy, ( a-ther'man-si ). [Gk. a, not; 

 thermaino, I heat.] The power of absorbing 

 radiant heat: corresponding to opacity in 

 the case of light. 



Athermanous, ( a-ther'man-us ). [ Ather- 

 mancy, q.v.] Not allowing heat to pass 

 through. 



Atherospermaceae, ( a-ther-o-sper-ma'se-e ) = 

 Plume-nutmegs : fragrant trees of Australia 

 and Chili, belonging to Menispermales. 

 Atherospennine, (a-the.r-o-sper'mm). A white 

 electric powder obtained from the bark of 

 Atherospenna. 



Atlanta, (at-lan'ta). A small molluscous ani- 

 mal, belonging to Gasteropoda. 

 Atlantes, (at-lan'tez). [The Greek name.]= 

 Atlantides : figures of men _":r^.-^r~ 

 used, instead of columns, 

 to support an entablature. 

 Cf. Caryatides. 

 Atlantic ooze, [Atlantic 

 Ocean.] A fine bluish-grey 

 tenacious calcareous mud, 

 with some sand and many 

 Globigerinaa. 



Atlantides, ( at-lan'ti-dez). 

 [The Greek name.] 1 = 

 Pleiades, q.v. 2 = Atlan- 

 tes, q.v. 



Atlas, (atlas). [Gk. Atlas, who was said to 

 carry the world. ] 1. The first vertebra of tho 

 neck, which supports the weight of the head. 

 2. A cluster of stars. A. moth = Saturnia 

 atlas, builds pensile nest. 

 Atmidoscope=Atmometer, q.v. ' 

 Atmology, (at-mol'o-ji). [Gk. atmos, vapour; 

 logos, discourse.] The science of the nature 

 and laws of vapours. 



Atmometer, ( at-mom'e-ter ). [Gk. atmos, 

 vapour; metron, measure.] An instrument 

 for measuring evaporation. 

 Atmosphere, (at'inos-fer). [Gk. atmos, vapour; 

 sphaira, sphere.] 1. The air surrounding 

 the earth; also any vapour surrounding any 

 heavenly body. v. Air. 2. Used as a measure 

 of pressure : 1 At. = about 15 Ibs. to the 

 square inch; 2 At. =30 Ibs., &c. 

 Atoll, (at'ol). [The Maldive name.]=Lagoon 

 island : a coral island, usually circular, hav- 

 ing a lake in the centre. 

 Atom, (at'om). [Gk. a, not; temno, I cut.] 

 An ultimate indivisible particle: estimated 



not to be smaller than goo ow 665 " 1C ^ 1 * n 

 diameter in the case of water. 

 Atomic, ( a-tom'ik ). [Atom, q.v.] Relating 

 to atoms. A. theory = Molecular theory: 

 the theory that every substance is com- 

 pounded of atoms which are unalterable 

 in size, weight, or density, and which 

 have a definite value in combining with 

 each other. A. volume = Equivalent vol- 

 ume Molecular volume = Specific volume 



atomic weight , , 

 = s ^ecifk gravity 1 the 8 P ace occupied by the 



quantity of a body proportionate to the 

 atomic weight. A. weight: used by Ber- 

 zelius to express the relative weights of equal 

 gaseous volumes. The relative weight of any 

 atom as compared with one atom of H. 



Atomicity, (a-to-mis'i-ti). [Atom, q.v.] The 

 combining capacity of a chemical element? 

 whether monatomic, diatomic, &c. 



Atrial, (a'tri-al). [L. atrium, hall or open 

 court.] Belonging to an open space or hall. 

 A. system: a mimber of connected cavities 

 open to the exterior, found in the bodies of 

 molluscoida. A. chamber = Atrium = The 

 largest of these cavities, serving as the clo- 

 aca. A. ftmic=The lining membrane of the 

 atrium. 



Atricha. A term used by Iloeven for a sub- 

 division of the Infusoria. 



Atriplex, (a'tri -picks). [Atriph'x, the Latin 

 name.]=Orache: an herb or shrub with small 

 flowers, belonging to Chenopodiacese. 



Atrium, (at'ri-urn). l=Atiial chamber, q.v. 

 2. A large hall of audience. 



Atropa, (at'ro-pa). [Gk. Atropos, one of the 

 Fates.J=Dwale: an herb with violet or green 

 flowers; mostly poisonous, belonging to Sola- 

 naceae. A. belladonna=t)e&dly nightshade. 

 A. maneZra<7ora=Mandrake. 



Atrophy, (at'ro-fi). [Gk, a, not ; trepho, I 

 nourish.] Wasting: want of nutriment. 



Atropia, (at-ro'pi-a). [Atropa, q.v.] = Atro- 

 pine = Daturine : composed of tropic and 

 atropic acids=C 1 7H 2 3NO 3 , a crystalline poi- 

 sonous alkaline base found in the atropa, 

 datura, <fec. Sulphate of atropia is an anti- 

 dote to Physostigma. 



Atropic acid, (at'ro-pik). [ Atropia. ^CgllgOo: 

 obtained from atropine, of which it is one of 

 the constituents. 



Atropous, (at'ro-pus). [Gk. a, not ; trepo, I 

 turn.] Used of seeds in which the embryo 

 does not turn during growth. Cf. Anatropal. 



Atrypa, (at'ri-pa). [Gk. a, without; trype, 

 hole.] A shell, belonging to Brachiopoda, 

 found in Palaeozoic and Trias rocks, in wliich 

 the foramen is very small. 



Attar (of roses), (at'tar). [H. utr, essence. ]= 

 CHo : a fragrant oily hydrocarbon obtained 

 from rose leaves. 



Attelabidse, ( at-te-lab'i-de ). A family of 

 beetles, belonging to Rhynchophoridae. 



Attic, (attik). [Gk. attikos, Athenian.] The 

 parapet wall forming the top of a facade; 

 also used for a room at the top of a house. 

 A. base: in Ionic and Doric consists of torus, 

 scotia, and torus, with fillets between. A. 

 story : the room or rooms behind the para- 

 pet wall or attic; also used generally for tho 

 top rooms of a house. 



Attraction, (at-trak'shun). [L. ad, to; tralio, 

 I draw.] The force which every body exerts 

 upon other bodies in tending to draw them 

 towards itself, of which gravitation is an 

 example. 



Attractylic acid, (at-trak-til'ik). A tribasic 



acid obtained from the root of Attractylia sp. 



Attwood's machine, [Attwood, the in-ventor.] 



