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rap-, rav- (Latin: tearing away, seizing, swift, rapid; snatch away, seize, carry off; from Latin rapere, "to seize by force and to carry off")
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rar-, rare- + (Latin: rarus, rare, thin, loose, sparse; airy, porous, infrequent, unusual)
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ratio-, reason- (Latin: reckoning, to reckon; calculating, calculation; understanding; thinking)
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reciproc- (Latin: reciprocus, turning back the same way, alternating; turning backward and forward; to give, to do, to feel, or to show in return)
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recti-, rect- (Latin: make right, adjust, remedy; make straight; to lead, put in a straight line; to rule)
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recto-, rect- (Latin: straight [intestine], direct, right; that is, "the part of the large intestine that ends at the anus")
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Reflexology: Treatment of the Feet (therapeutic applications to the feet for greater health)
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regi-, reg-, rec-, rex- (Latin: to direct, to rule, to lead straight, to keep straight; to guide, to govern)
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reminisc- (Greek > Latin: to recollect, to remember; act of recalling; to recall to memory; to remind of past events)
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render- (Latin: rendere from reddere, "to give back, to restore; to give up; to translate")
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reptil-, rept- (Latin: creeping)
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reticulo-, reticul-, reticu-; reti-, ret-; reticulato- (Latin: net, small net; a netlike structure, a network)
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Retina: Photoreceptor Cells (millions of photoreceptor cells residing in the human retina gather light and transmit signals to the brain)
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retino-, retin- + (Latin: innermost tunic of the eye; from ret[e], "net" plus -ina, "like")
Related references to "eye" or "eye part" word families: blepharo-; core-; corneo-; eye, eyes; irido-; lenti-, lens-; lenticulo-; ocelli-; oculo-; op-, -optic; ophthalmo-; phaco-; uveo-.