RIN- 



277 



ROS- 



are cylindrical ; opp. scale bark 

 (bot.). 



ringent (nn'jgnt) a. [L. ringi, to 

 open the mouth wide.] Having 

 the lips, as of a corolla, or valves, 

 separated by a distinct gap (bot., 



KfoL). 



ringless, appl. Ferns without an 

 annulus (dot.). 



riparial (ripa'rial), riparian (ripa'rlan), 

 riparious (ripa'rius) a. [L. ripa, a 

 river bank.] Frequenting, growing 

 on, or living on the banks of 

 streams or rivers (dot., zool.). 



ripe (rip) a. [A.S. ripe, fit for reap- 

 ing.] Having seeds mature and 

 ready for germination (dot.). 



risorius (nso'rius) n. [L. risus, 

 laughter.] A cheek muscle stretch- 

 ing from over the masseter muscle 

 to the corner of the mouth (anat.). 



rivose (ri'vos) a. [L. rivus, a stream.] 

 Marked with irregularly winding 

 furrows or channels. 



rivulose (riv'ulos) a, [L. rivulus, a 

 rivulet.] Marked with sinuate 

 narrow lines or furrows (dot.). 



rod epithelium, epithelium con- 

 sisting of apparently striated cells 

 (Phys.). 



rod fibre, the fibre with which a rod 

 of the retina is connected internally 

 (anat.). 



rod fructification, fructification oc- 

 curring in basidiomycetous Fungi 

 by means of rod-like gonidia from 

 a hyphal branch (dot.}. 



rod granule, the nucleus of a rod 

 fibre (anaf.). 



rodent (ro'dgnt) n. [L. rodere, to 

 gnaw.] An animal with a habit of 

 gnawing or nibbling, as a rabbit. 



rods and cones, the nerve-epithelium 

 layer of the retina (anaf.). 



root (root) n. [A.S. wyrf, a root.] 

 The descending portion of a plant, 

 fixing the plant in the soil, and 

 absorbing, nourishment (dot.). 



root absorption, osmosis (dot.). 



root borer, a larval form or Insect 

 which bores into the roots of plants 

 (zool.). 



root cap, a protective cap of tissue 

 at the apex of a root (dot.). 



root cell, the clear colourless base 

 of one of the Algae attaching the 

 thallus to its substratum (hot.). 



root climber, a plant which climbs 

 by means of roots developed from 

 the stem (bot.). 



root hairs, unicellular epidermal 

 outgrowths from roots, of protective 

 and absorbent function (bot.). 



root leaf, a basal leaf (bot.). 



root parasitism, a condition ex- 

 hibited by semi-parasitic plants, the 

 roots of which penetrate the roots 

 of neighbouring plants and draw 

 from them elaborated food material 

 (bot.). 



root pocket, a sheath containing 

 a root, especially of aquatic plants 

 (bot.). 



root pressure, the force by which 

 water is made to rise in the axial 

 stele of a plant, a main factor in the 

 transport of water through the 

 plant (bot.). 



root process, a branched colourless 

 structure fixing an Alga thallus to 

 soil (bot.). 



root sheath, an orchid velamen 

 (bot.) ; that part of a hair follicle 

 continuous with the epidermis 

 (anat.). 



root stalk, a rhizome (bot.) ; the 

 root - like horizontal portion of 

 Hydrozoa (zool.). 



root tubercle, a small swelling on a 

 legume root, caused by Bacteria 

 (bot.). 



rootlet, an ultimate branch of a root 

 (bot.). 



rosaceous (roza'shus) a. [L. rosa, a 

 rose.] With five petals arranged 

 in a circle ; formed like a rose (bot.). 



rosellate (rozfil'at) a. [L. rosa, a rose.] 

 Arranged like rosettes. 



Rosenmuller's (ro'zgnmiil'e'rz) organ, 

 a uterine rudimentary organ 

 homologous with the epididymis 

 (anat.). 



rosette (roze"t') n. [L. rosa, a rose.] 

 A cluster of leaves arising in close 

 circles from a central ax's (dot.) ; 

 a thin plate formed by the coales- 

 cence of the basal s of a larval 

 Crinoid ; a large ciliated funnel 

 leading out of the anterior sperm 

 reservoir of the Earthworm (zool.). 



rosette organ, in certain Ascidians, 

 the ventral complex stolon from 

 which buds are constricted off 

 (zool.). 



