ARO- 



23 



ASC- 



arolium (an/Hum) n. [Gk. arole, pro- 

 tection.] Pad between the claws 

 on tarsus of Orthoptera (zool.). 



arrectores pilorum, bundles of non- 

 striped muscular fibres associated 

 with the hair follicles, on con- 

 traction, they render the hair more 

 erect (p/iys.). 



arrhenoplasm (arSn'oplazm) . [Gk. 

 arrenos, male ; plasma, something 

 moulded.] Male plasm, in reference 

 to the theory that all protoplasm 

 consists of arrhenoplasm and thely- 

 plasm (diol.). 



arrhenotoky (argnot'oki) . [Gk. 

 arrenos, male ; tokos, birth.] Pro- 

 duction of males parthenogenetic- 

 ally (zool.). 



arterial (arte'rial) a. [L. arteria, 

 artery.] Pert, an artery, or the 

 system of channels by which the 

 blood issues to the body from the 

 heart ; appL blood, duct, gland 

 (anat.). 



arterial sclerosis, hardening of the 

 walls of the arteries, said to con- 

 tribute to natural death (phys.). 



arteriole (arte'rlol) n. [L. arteriola, 

 small artery.] A small or branch 

 artery (anat.). 



artery (ar'te"r!) n. [L. arteria, artery.] 

 A vessel which conveys blood from 

 heart to body (anat.). 



arthritic (arthrit'ik) a. [Gk. arthron, 

 joint.] Pert, or at joints (anat.). 



arthrobranchiae (aYthrobrang^kle, 

 -kla) n. plu. [Gk. arthron, a joint ; 

 drangchia, gills.] Joint-gills, arising 

 at the junction of thoracic append- 

 ages with trunkof Arthropods (zool.). 



arthrodia (arthro'dia) . [Gk. arthron, 

 joint.] A joint admitting of only 

 gliding movements (anat.). 



arthrodlal (arthro'dlal) a. [Gk. 

 arthron, joint.] Appl. the articular 

 membranes connecting thoracic 

 appendages with trunk, as in 

 Arthropods (zool.). 



arthromere (ar'thrb'mer) n. [Gk. 

 arthron, joint ; meros, part.] An 

 arthropod body-segment or somite 

 (zool.). 



arthropod (ar'thropod) a. [Gk. 

 arthron, joint ; pous, foot.] Of or 

 pert, the Arthropoda (zool.). 



arthropterous (arthr6p't6rus) a. [Gk. 

 arthron, joint ; pteron, wing.] 



Having jointed fin-rays, as in fishes 

 (zool.). 



arthrospore (Arth'rospor) n. [Gk. 

 arthron, joint ; sporos, seed.] A 

 resting bacterial cell (hot.}. 



arthrosterigmata (ar'throste'rig'mata) 

 n.plu. [Gk. arthron, joint; sterigma, 

 a support] Jointed sterigmata (dot.'). 



arthrostracous (arthrSs'trakus) a. 

 [Gk. arthron, joint ; ostrakon, shell.] 

 Having a segmented shell (zool.). 



articular (artik'ula>) a. [L. articulus, 

 joint] Pert, or situated at a joint 

 or joints ; appl. cartilage, lamellae, 

 surface, capsule, etc. (anat.}. 



articulated (artik'ulate'd) a. [L. arti- 

 culus, joint.] Jointed ; separating 

 easily at certain points (fe&jl 



articulation (irtikula'shun) n. [L. 

 articulus, joint.] A joint, between 

 bones or segments (zool.\ or seg- 

 ments of a stem (dot.). 



artifact (ar'tlfakt) n. [L. ars, art; 

 facere, to make.] Any appearance 

 produced by a reagent or other 

 artificial means (biol^). 



artiodactyl (ar'tiodaktil) a. [Gk. 

 artios, equal ; daktylos, finger.] 

 Having an even number of fingers 

 or toes (sool.) 



arytenoid (arjrte'noid) a. [Gk. 

 arytaina, a pitcher.] Pitcher-like, 

 appl. two cartilages at the back of 

 the larynx, also glands, swellings, 

 etc. (anat.\ 



asci (as'I, as'kl, as'ke) n. plu. [Gk. 

 askos, bladder.] Membranous spore- 

 sacs of fungi within which the 

 ascospores are formed (dot.}. 



ascidian (asld'Ian) a. [Gk. askidion, 

 dim. of askos, bag.] Like an 

 ascidian or sea-squirt (zool.). 



ascidium (asld'lum) n., ascidia (asTd'Ia) 

 plu. [Gk. askidion, little bag.] 

 Pitcher-leaves, as in Nepenthes 

 (dot.). 



ascigerous (aslj'grus) a. [Gk. askos, 

 bag ; L. gerere, to bear.] Bearing 

 asci, as certain hyphae in Fungi 

 (dot.). 



ascocarp (as'kokarp) n. [Gk. askos, 

 bag ; karpos, fruit.] The protective 

 covering investing the asci (dot.). 



ascogenous (ask8j'5nus) ^ a. [Gk. 

 askos, bag ; gignesthai, to pro- 

 duce.] Bearing asci (dot.). 



ascogonium (as'kogo'nTum) n. [Gk. 



