158 



GLOSSARY. 



bulwark plains, but smaller and 

 more regular in outline. 



Ri'sus Sardon'icus (Lat. Sardon'ic 

 laugh). A kind of convulsive grin 

 observed in some diseases : so called 

 because supposed to be produced 

 by a species of ranunculus growing 

 in Sardinia. 



Ro'dent (Lat. ro'do, I gnaw). Gnaw- 

 ing ; applied to an order of mam- 

 mals which, nibble and gnaw 

 their food, as the squirrel, rat, 

 hare, &c. 



Boot. In arithmetic, the root of any 

 quantity is that which, if multi- 

 plied into itself a certain given 

 number of times, will exactly pro- 

 duce the quantity. 



Rosa'ceous (Lat. rosa, arose). Be- 

 longing to the rose tribe of plants ; 

 like a rose. 



Rostellum (Lat. a little beak, from 

 ros'trum, a beak). A beak -shaped 

 process. 



Ros'tral (Lat. ros'trum, a beak). Be- 

 longing to a beak. 



Ros'trate (Lat. ros'trum, a beak). 

 Having a beak, or process resem- 

 bling a beak. 



Ros'trum (Lat. a beak). A beak ; 

 anything projecting or shaped like 

 a beak. 



Rota'tion (Lat. ro'ta, a wheel). The 

 movement of a body on its axis ; 

 in agriculture, the mode in which 

 different kinds of crops are made 

 to succeed each other in the same 

 ground. 



Rota'tor (Lat. ro'ta, a wheel). That 

 which gives a circular or rolling 

 motion ; applied to certain muscles 

 of the body. 



Ro'tatory (Lat. ro'ta, a wheel). Turn- 

 ing on an axis ; moving in succes- 

 sion. 



Rotheln (Germ.). A form of eruptive 

 febrile disease, partaking of the 

 characters of both measles and 

 scarlet fever. 



Rotifera (Lat. ro'ta, a wheel ; fer'o, 

 I bear). Wheel-bearers ; a class of 

 animalcules, which have circles of 

 cilia, appearing under the micro- 

 scope like wheels in motion. 



Rotund (Lat. rotun'dus, round). 



Round; bounded by a curve without, 

 angles. 



Rouleaux (Fr.). Rolls. 



Rubefa'cient (Lat. ruler, red ; fac'io, 

 I make). Making red ; an appli- 

 cation which produces redness of 

 the skin, not followed by a blister. 



Rube'ola (Lat. ruber, red) . A term 

 often used for measles, but now 

 applied to the eruptive disease 

 called rotheln, which presents the 

 characters of both measles and 

 scarlet fever. 



Rubes'cent (Lat. rubes'co, I become 

 red). Becoming red ; tending to a 

 red colour. 



Ru'diment (Lat. rudimen'tum). A 

 first principle or element ; the 

 original of anything in its first or 

 most simple form. 



Rudimen'tary (Lat. rudimen'tum, a 

 first principle). Belonging to or 

 consisting in first principles ; in an 

 original or simple state ; arrested 

 in development. 



Rugae (Lat. plaits or folds). The 

 folds into which the mucous mem- 

 brane of some organs is thrown, 

 when they are not distended, by 

 contraction of the external coats. 



Ru'gate (Lat. ruga, a wrinkle). 

 Wrinkled. 



Ru'gose ^Lat. ruga, a wrinkle). 

 Full of wrinkles. 



Ru'minant (Lat. rumen, the cud). 

 Chewing the cud ; applied to an 

 order of herb-eating animals, of 

 which the camel, cow, and sheep, 

 are examples. 



Ru'minate. In botany, applied to 

 the albumen of the seed when it 

 presents a mottled appearance, as 

 in the nutmeg. 



Run'cinate (Lat. runci'na, a large 

 saw). In botany, applied to pin- 

 natifid leaves Avith more or less 

 triangular divisions, pointed down- 

 wards towards the base, as the 

 dandelion. 



Ru'nic (Icelandic runa, a furrow or 

 line). A term applied to the alpha- 

 bet of the ancient Scandinavians, 

 consisting of letters of peculiar 

 shape, principally formed of straight 

 lines cut on wood or stone. 



