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reduviid (rgdu'vnd) a. [L. reduma, 

 a hang nail.] Appl. eggs of certain 

 Insects, protected by micropyle 

 apparatus with porches (zool.). 



reflected (refleVtgd) a. [L. reflectere, 

 to turn back.] Turned or folded 

 back on itself (anat.}. 



reflex (re'flgks) a. [L. reflectere, to 

 turn back.] Involuntary ; appl. 

 reaction to stimulus (phys.}. 



reflex action, the simplest expres- 

 sion of the principles according to 

 which the nervous system acts. 

 Elements that appreciate stimuli 

 and elements that react to stimuli 

 are switched on to one another, 

 without direct appeal to the brain, 

 by means of a subsidiary nerve 

 centre, the result being so-called 

 involuntary action (phys.}. 



reflexed (re'fleksd) a. [L. reflectere, 

 to turn back.] Curved or turned 

 backwards. 



refracted (refrak'ted) a. [L. re, back ; 

 frangere, to break.] Bent back- 

 wards at an acute angle. 



regeneration (reje'n'era'shun) n. [L. 

 re, again ; generare, to beget.] The 

 renewal of a portion of the body 

 which has been lost (biol.}. 



regma '(reg'ma) n . [Gk. regma, frac- 

 ture.] A seed-vessel the valves of 

 which open by an elastic move- 

 ment (dot.}. 



Beissner's membrane, the mem- 

 brana vestibularis, stretching from 

 the lamina spiralis ossea to the 

 outer cochlear wall of the ear 

 (anat.}. 



rejuvenescence (re'joove'ne's'e'ns) n. 

 [L. re, again ; juvenescere, to grow 

 young.] A renewal of youth ; in 

 cells, renewed life and vigour 

 following on conjugation and inter- 

 change and fusion of nuclear and 

 protoplasmic material (cyt.}. 



remiges (rfim'ijez) n. plu. [L. remex, 

 a rower.] The large feathers or 

 quills of a bird's wing, comprising 

 primaries and secondaries (zool.}. 



remiped (rem'fpe'd) n. [L. remus, 

 oar ;pes, foot] Having feetadapted 

 for rowing motion (zool.}. 



ren (ren) n., renes (ren'ez) plu. [L. 

 ren, kidney.] The kidneys. 



renal (re'nal) a. [L. ren, kidney.] 

 Pert, kidneys. 



renal portal, appl. a system of cir- 

 culation in which some of the 

 returning blood passes through the 

 kidneys {zool.}. 



renes, see ren. 



reniform (ren'iform) a. [L. ren, 

 kidney ; forma, shape.] Shaped 

 like a kidney (biol.}. 



renopericardial (re'noper'ikar'dial) a. 



gL. ren, kidney ; Gk. peri, round ; 

 ardia, heart.] Appl. a narrow 

 ciliated canal connecting kidney 

 and pericardium in higher Molluscs 

 (zool.}. 



repand (repand') a. [L. repandus, 

 bent backwards.] Appl. a leaf with 

 undulated margin (bot.}. 



repandodentate (repan'doden'tat) a. 

 [L. repandus, bent backwards ; dens, 

 a tooth.] Varying between undu- 

 lated and toothed (bot.}. 



repent (re'pent) a. [L. repere, to 

 crawl.] Creeping along the ground ; 

 appl. ground creepers (bot.}. 



replicate (rgp'likat) a. [L. re, back ; 

 plicare, to fold.] Doubled over on 

 itself (biol.}. 



replicatile (repllk'atil) a. [L. re, back ; 

 plicare, to fold.] Appl. wings which 

 are folded back on themselves when 

 at rest (zool.}. 



replum (rep'lum) n. [L. replum, a 

 bolt.] The longitudinal division 

 between the valves of some peri- 

 carps, as in some Legumes ; a 

 placental dissepiment (bot.}. 



reproduction (re'produk'shun) n. [L. 

 re, again ; pro, forth ; ducere, to 

 lead.] The process by means of 

 which the race is continued, whether 

 sexual or through cell-rupture, cell- 

 division, budding, spore-formation, 

 conjugation, or parthenogenesis 

 (biol.}. 



reproductive (re'produk'tlv) a. [L. 

 re, again ; pro, forth ; ducere, to 

 lead.] Appl. organs concerned in 

 reproduction (biol.}. 



reptile (rep'til) n. [L. repere, to 

 crawl.] An animal that crawls 

 along the ground or close to the 

 ground, as serpents, lizards, etc. 

 (zool.}. 



reptilian (reptll'ian) a. [L. repere, to 

 creep.] Pert, reptiles (zool.}. 



reptiloid (rep'tiloid) a. [L. repere, 

 to crawl ; Gk. eidos, form.] With 



