ROS- 



278 



RUG- 



rosette plate, five interradial basal 

 plates united together in Crinoids 

 (zool.}. 



rostel (ros'tei) n. [L. rostellum, dim. 

 of rostrum, a beak.] A rostellum. 



rostellar (rostel'ar) a. [L. rostellum, 

 a small beak.] Pert, a rostellum. 



rostellate (rostel'at) a. [L. rostellum, 

 a small beak.] Furnished with a 

 small beak. 



rostelliform (rosteTiform) a. [L. 



. rostellum, a small beak ; forma, 

 shape.] Shaped like a small beak. 



rostellum (rosteTum) n. [L. rostellum, 

 a small beak.] A small rostrum ; a 

 projecting structure developed from 

 one of the stigmatic surfaces of the 

 orchid flower (bot.} ; a rounded 

 prominence, furnished with hooks, 

 on the head of a Tapeworm (zool.') ; 

 a beaked-shaped process (anat.}. 



rostral (rSs'tral) a. [L. rostrum, a 

 beak.] Pert, a rostrum. 



rostrate (ros'trat) a. [L. rostrum, a 

 beak.] Beaked. 



rostriform (ros'trif6rm), rostroid 

 (rSs'troid) a. [L. rostrum, a beak ; 

 forma, shape ; Gk. eidos, resem- 

 blance.] Beak-shaped. 



rostrulate (ros'troolat) a. [L. ros- 

 trulum, a small beak.] Like a 

 rostrulum. 



rostrulum (ros'troolum) n. [L. ros- 

 trulum, a small beak.] A small 

 rostrum. 



rostrum (ros'trum) n. [L. rostrum, 

 a beak.] A beak or beak-like 

 process ; the projecting process 

 between the eyes of a Crayfish ; a 

 median ventral plate at the base of 

 the capitulum of Cirripedes ; etc. 

 (zool.}. 



rosular (roz'ular), rosulate (roz'ulat) 

 a. [L. rosa, a rose.] Arranged in 

 rosettes. 



rot (rot) n. [A.S. rattan, to rot.] 

 Decay ; decomposition ; disease 

 caused by Fungi or Bacteria (bot.} ; 

 a parasitic disease causing emacia- 

 tion (zool.}. 



rotate (rotat') a. [L. rota, a wheel.] 

 Shaped like a wheel ; with flat and 

 spreading parts (bot.}. 



rotation (rota'shun) n. [L. rota, a 

 wheel.] Turning as on a pivot, 

 as limbs (phys.} ; circulation, as of 

 cell sap (bot.}. 



rotator (rota'tor) n. [L. rota, a wheel.] 

 A muscle which allows of circular 

 motion (anat.}. 



rotatores spinae, paired muscles, 

 one on each side of the spine, each 

 arising from a transverse process 

 of a vertebra and inserted into the 

 vertebra next above (anat.}. 



rotiform (ro'tiform) a. [L. rota, a 

 wheel ; forma, shape.] Wheel- 

 shaped ; circular. 



rotula (rot'ula) n. [L. rotula, a small 

 wheel.] One of five radially-directed 

 bars bounding the circular aperture 

 of the oesophagus of a Sea-urchin 

 (zool.} ; the patella or kneecap 

 (anat,}. 



rotular (rot'ular) a. [L. rotula, a small 

 wheel.] Pert, the rotula. 



rotuliform (rotu'liform) a. [L. rotula, 

 a small wheel ; forma, shape.] 

 Shaped like a small wheel. 



rotundifolious (rotun'difo'lius) a. [L. 

 rotundus, -round ; folium, a leaf.] 

 With rounded leaves (bot.}. 



rouleaux (rool'6, rool'oz) n. plu. [F. 

 rouleau, a wheel.] Formations like 

 piles of coins into which red blood 

 corpuscles tend to aggregate when 

 blood is at rest (pkys.}. 



rubiginose (roobij'mos), rubiginous 

 (roobij'inus) a. [L. rubigo,^ rust.] 

 Of a brownish-red tint ; with the 

 colour of rust ; affected by rust 

 parasites (bot.}. 



ruderal (rood'gral) a. [L. rudus, 

 debris.] Growing among rubbish 

 or debris (bot.}. 



rudimentary (rood'imgn'tari) a. [L. 

 rudimentum, a first attempt] In 

 an imperfectly developed condition ; 

 at an early stage of development ; 

 arrested at an early stage ; ves- 

 tigial, in certain authors (biol.}. 



ruff (ruf) n. [A.S. reafan, to reave.] 

 A neck fringe of hair or feathers 

 (zool.}. 



ruga (roog'a) n. [L. ruga, a wrinkle.] 

 A fold or wrinkle, as the folds of 

 the mucous membrane of certain 

 organs (anat.}. 



rugate (roog'at), rugose (roog'os), 

 rugous (roog'us) a. [L. ruga, a 

 wrinkle.] Wrinkled ; with many 

 wrinkles on the surface. 



rugulose (roog'ulos) a. [L. ruga, a 

 wrinkle.] Finely wrinkled. 



