ARC 



32 



ABJ 



of its fibres which emerge at the 

 anterior median fissure, and 

 form a band which curves round 

 the lower border of the olivary 

 body, or which passes transversely 

 across it, and round the sides of 

 the medulla. 



Arctium, n. , drk'ti-um (Gr. arktos, 

 a bear in reference to its rough, 

 bristly fruit), a genus of plants 

 of the Sub-ord. Cynarocephalse, 

 Ord. Composite: Arctium lappa, 

 ldp'-pd (L. lappa, a bur), the 

 burdock, which is bitterish, and 

 has been used in the form of in- 

 fusion as a substitute for sarsa- 

 parilla. 



Arctostaphylos, n., drk'to-sldf-il- 

 8s (Gr. arktos, a bear ; staphule, 

 a grape in allusion to the 

 rough taste of the fruit), a genus 

 of plants, Ord. Ericaceae : 

 Arctostaphylos uva-ursi, uv'-a- 

 ers'-i (L. uva, a grape -berry ; 

 ursi, of the bear), the bearberry, 

 whose fruit is used as an astring- 

 ent: A. glauca, gldwk'a (L. 

 glaucus, bluish grey), the man- 

 zanita plant, which covers the 

 mountains of California with a 

 thick brushwood. 



arcuate, a., drk'-u-dt (L. arcus, a 

 bow), curved in an arched man- 

 ner like a bow. 



arcus senilis, drk'-us s&n-ll'is (L. 

 arcus, a bow, an arch ; senilis, 

 aged), the arch of the aged; 

 a circular, opaque appearance 

 round the margin of the cornea 

 of aged persons, usually affecting 

 both eyes. 



ardellas, n. plu., dr-aWle (Gr. 

 arddlos, dirty, foul from ardo, 

 I sprinkle), small apothecia of 

 certain lichens, as Arthonia, 

 having the appearance of dust. 



Areca, n. plu., dr-ek'-d (Indian 

 name), a genus of plants of the 

 Ord. Palime: Areca catechu, 

 kat'e-shdo (said to be Japanese 

 kate, a tree; chu, juice), an eleg- 

 ant palm producing the betel 

 nut, and an extract of an astring- 



ent nature like catechu : Are- 

 cinese, n. plu., ar'-e-sm'-Z-e, the 

 first of the five tribes into which 

 the Ord. Palmse is divided. 



arenaceous, a., ar'en-a'-shus (L. 

 arena, sand), composed of grains 

 of sand ; having the properties 

 of sand. 



areola, n., tir-ettlti, (L. dredla, a 

 small open place, a small garden 

 bed), the small coloured circle 

 round the nipple, or a pustule: 

 areolae, n. plu., dr-e'-dl-e, small 

 interstices of cellular or other 

 tissues ; little spaces on the area 

 or surface; the spaces between 

 the cracks in the lichens : are- 

 olar, a., ar-e'-dl-ar, of or like an 

 areola: areolate, a., dr-e'-ol-dt, 

 in bot., divided into distinct 

 angular spaces. 



Arethusa, n. plu., dr f -%>tliuz'd 

 (after a nymph of Diana's, who 

 was changed into a fountain), a 

 genus of plants, Ord. Orchidacese: 

 Arethusa bulbosa, bulb oz'- d 

 (L. bulbus, a bulbous root), a 

 plant which has a large fine lilac 

 flower terminating each stem. 



arillus, n., dr-tt'-lus, also aril, 

 n., dr'-il (Fr. arille, an arillus ; 

 Sp. arillo, a small hoop from 

 aro, a hoop ; L. aridus, dry), the 

 exterior coat of a seed which 

 drying falls off spontaneously : 

 arillate, a., dr-il^ldt, having an 

 aril: arillode, n., ar'-il-lod (Gr. 

 eidos, resemblance), an extra 

 covering of the seed ; the 'arillus' 

 proceeds from the placenta, as in 

 the passion-flower, the 'arillode' 

 from the exostome, as in the mace 

 of the nutmeg. 



arista, n., ar-ist'-a (L. arista, the 

 beard of an ear of corn), a long 

 pointed process, as in barley and 

 many grasses ; an awn : arist- 

 ate, a., dr-ist<dt, furnished with 

 beards or spikes, as barley and 

 many grasses; awned: aristulate, 

 a., dr-ist'ul'dt, having a very 

 small arista. 



Aristolochiaceae, n. plu., ar-istio* 



