ROC 



362 ROS 



handsome when in flower, Ord. 

 Leguminosse, Sub-ord. Papilion- 

 acese : Robinia pseudo-acacia, 

 sud'-o - ak'kd'-slii'd (Gr. pseudes, 

 false ; Eng. acacia), a species 

 often cultivated in Britain, as the 

 locust tree, producing a durable 

 wood. 



Roccella, n., rM-sVl'-ttt (Port. 

 roccha, a rock, so named from 

 its habitat), a genus of plants, 

 Ord. Lichenes : Roccella tinct- 

 oria, tinglct-or'-l-a (L. t'mctorius, 

 of or belonging to dyeing from 

 tingo, I dye), from the Canaries ; 

 R. fuciformis, fus'-i>f$rm'is (Gr. 

 phukos, L. fucus, sea-weed, rock- 

 lichen ; L. forma, shape) ; arid 

 R. hypomecha, hip-omf-ek-d (un- 

 ascertained), are species which 

 furnish valuable dyes, under the 

 name of Orchil or Archil, the 

 general name of the dye being 

 Litmus. 



Rodentia, n. plu., rod-Vn'sht'ci (L. 

 rodens, eating away, gnawing ; 

 gen. rodentis), an Order of the 

 Mammals, so named from the 

 habit of gnawing or nibbling, as 

 the rat, the rabbit, etc. : rodent, 

 a., rod'Znt, gnawing: n., one of 

 the gnawers : rodent ulcer, a 

 malignant form of ulceration, 

 allied to cancer, generally on the 

 upper part of the face. 



root, the subterranean or descend- 

 ing axis of a plant : root-cap, in 

 bot., a mass of tissue, covering 

 as a helmet the punctatum veget- 

 ationis of a root : root-sheath, 

 the coleorhiza : root-stock, the 

 rhizome of a plant. 



Rosaceae, n. plu., roz-a'se-e (L. 

 rosa, Gr. rhodon, a rose), the 

 Rose family, an extensive Order 

 of plants, well known for their 

 beauty, fragrance, and grateful 

 products, such as the strawberry 

 and blackberry : Rosa, n., roz'a, 

 a genus of plants unrivalled for 

 the fragrance and beauty of its 

 flowers : Rosa spinosissima, spin- 

 d-sis'-sim-d (L. splnosus, thorny, 



prickly from splna, a thorn), 

 the very thorny rose ; the species 

 from which the varieties of the 

 Scotch roses have been derived : 

 R. canina, Jcan-in'a (L. cdnlnus, 

 of or pert, to a dog from cdnis, 

 a dog), the Dog-rose, is beat into 

 a pulp after the hairy achenes 

 have been removed, and used, 

 sweetened, as an acidulous re- 

 frigerant and astringent : R. 

 Gallica, g&lf-lflc-a (L. galticus, of 

 or pert, to the Gaul from Galli, 

 the Gauls or French), the red, 

 French, and Provence rose, whose 

 petals are employed, in the form 

 of infusion, as a tonic and slight 

 astringent : R. centifolia, sentf-i- 



fol'-i-d (L. centum, a hundred ; 



ftitium, a leaf), the petals of the 

 hundred-leaved or Cabbage-rose, 

 and its varieties : R. Damascena, 

 dam'-aS'Sen'-d (of or from Damas- 

 cus), the petals of the Damask- 

 rose ; R. moschata, m6sk-dt'-d 

 (mid. L. moschdtus, having a 

 smell like musk from Arabic 

 mosch, musk), the petals of 

 the Musk-rose, and others, are 

 employed in the production of 

 rose-water, and the oil or attar of 

 roses: rosaceous, a., roz-a'shus, 

 arranged in a circular form, as the 

 petals of a single rose. 



rose, n., roz (L. rosa, a rose), the 

 popular name in Scotland for Ery- 

 sipelas, so named from its colour : 

 roseola, n., roz-e'Sl-d (mid. L. ros- 

 eola, a little rose), inmed., a rose- 

 coloured rash of several varieties. 



rosette, n., roz-et' (F. rosette 

 from L. rosa, a rose), in bot., a 

 cluster of leaves disposed in close 

 circles. 



Rosmarinus, n., rds'-mar-m'-tis (L. 

 ros, dew ; mdrlnus, belonging to 

 the sea from mar$, the sea), a 

 genus of pretty shrubs, so named 

 from their maritime habitat : 

 Rosmarinus officinalis, df-fzs'm- 

 aV-is (L. officmalis, officinal, by 

 authority from offlclna, a work- 

 shop), Rosemary, whose flowering 



