ROT 



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ROY 



ROSMARI'NUS. Rosemary. A genus of 

 permanent plants. Diandria Monogyn.ia. 

 Two species, one a native of the south of 

 Europe, the other of South America. 



ROSTEL'LUM, Lat. rostrum. 1. An ele- 

 vated portion of the stigma of orchida- 

 ceous plants. 2. The word denotes the 



mouth of the louse and other apterous 



insects. 3. The uucinated proboscis of 



;he tape- worms. 



ROS'TER. In military r.ffairs, the plan 

 or table by which all military duty is 

 regulated. 



ROS'TRATE, Lat. rostratits, beaked : from 

 rostrum, a beak. Applied to parts of 

 plants and to shells, &c., which have a 

 beak-like process. 



HOST-DROP. Acne rosea. A disease, 

 which exhibits itself in suppurating 

 tubercles, especially about the nose and 

 cheeks, the surrounding skin being in- 

 flamed, and of a shining rosy redness ; 

 often induced by intemperance. 



ROT. In nosology, a disease incident to 

 sheep, and other domestic animals, in 

 which the liver and lungs are affected, 

 frequently accompanied by a tendency to 

 dropsy. 



ROTA'TION, from roto, to turn. Motion 

 round an axis, as distinguished from the 

 progressive motion of a body revolving 

 round another body, or a distant point, 

 as a centre. Thus, the daily turning of 

 the earth on its axis is a rotation ; its an- 

 nual motion round the sun is a revolution. 



ROTA'TION OF CROPS. In agriculture, 

 the succession of crops which are sown 

 on the same soil, year by year. A variety 

 of crops is found to preserve the soil more 

 isrtile than if crops of the same kind were 

 u> be continually raised upon it. 



RO'TARY, or ROTATORY ENGINE (called 

 also a Concentric engine, and a Steam- 

 wheel). An engine worked by the elastic 

 force of the steam acting upon pistons 

 fixed to an axis, whereby the latter is 

 put in motion, instead of being turned by 

 means of pistons worked in hollow cylin- 

 ders, and communicated by the crank 

 motion. Such are A very 's Rotary Engine, 

 the Patent Rotative Disc-engine, and 

 Uunnett and Corpe's Concentric Engine. 



ROTA'TOR, Lat. from roto, to turn. A 

 rauscle, the office of which is to turn 

 round the part upon which it acts. 



ROTIF'ERA, Lat. from rota, a, wheel, and 

 fero, to bear. The name of an order of 

 infusory animals. The body is oval, and 

 gelatinous, and most commonly termi- 

 nates posteriorly in a tail that is variously 

 constructed, and anteriorly it bears a 

 singular organ variously lobate, and 

 denticulated edges, and of which the den- 

 ticnlations vibrate successively in such a 

 manner as to give the organ itself the 

 appearance of one or more dentated and 

 Devolving wheels. 



ROT, or ROT'TEN STONE. A name which 

 has been applied indiscriminately to all 

 the species of Tripoli ; but ought, accord- 

 ing to some, to be confined to those 

 varieties which are most light and fri- 

 able, and have a line grain. It occurs in 

 Derbyshire. 



ROTUN'DA, ) It'll, from Lat. rottindu$, 



ROTUN'DO, 1 round. A round building, 

 as the Pantheon at Rome. 



ROUE'. In the beau monde, a person 

 devoted to a life of pleasure and sensuality. 



ROUGE (French;. Red paint: applied 

 more especially to a cosmetic prepared 

 from the saffron flower or flower of the 

 Carthamus tinctorius, which is also in 

 use for dyeing silk. 



ROUGH-CASTING. In building, the ordi- 

 nary mode of finishing the plaster and 

 lath outside work of cottages and inferior 

 buildings. A pricking-up coat of hair- 

 mortar is first put on, upon which, when 

 tolerably dry, a smooth coat of the same 

 mixture is laid, and a second workman 

 follows with a vessel full of thinner 

 mixture, which he throws over the work 

 as fast as it is finished : this last opera- 

 tion produces an uniformity of colour. 



ROUGH STUCCO. Stucco floated and 

 brushed in a small degree with water. 



ROUNDEL. In heraldry, a circular spot. 



ROUND'HEADS. A name given to the 

 Puritans, in contempt for the practice 

 which prevailed among them of cropping 

 the hair round. 



ROCND'HOUSE. 1. A constable's prison. 



- 2. In ships, an apartment in the after 

 rt of the quarter-deck, having the poop 



its roof: sometimes called the coach. 



ROUND NUMBER. A number which ends 

 with a cipher. 



ROUND-ROBIN, Fr. rond and ruban. A 

 written petition, memorial, or remon- 

 strance, signed by names in a circle, so 

 as not to shew who signed it first. 



ROUND TABLE, KNIGHTS OF THE. The 

 famous English order of knights in the 

 time of King Arthur. 



ROUP. A Scotticism for auction. 



ROW'EL, Fr. rouelle, dim. of roux. 1. In 

 horsemanship, the little wheel of a spur. 



- 2. In farriery, a roll of hair or silk 

 used as an issue on horses, answering to 

 a seton in surgery. - 3. A little flat ring 

 or wheel of plate or iron on a horse's bit. 



Ro LOCK. The part of a boat's gun- 

 wale oa Thich the oars rest in rowing. 



ROW-/C*T. A little square hole in the 

 side of small vessels of war, near the sur- 

 face of the water, for the use of an oar in 

 rowing in a calm. 



ROY'AL. A term which as an adjec- 

 tive means kiagly ; as a noun (1.) A large 

 size of paper; (2.) In ships, a small sail 

 spread immediately above the top-gal- 

 lant-sail ; sometimes termed the top- 

 gallant-royal ; (*.) in artillery, small 



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