Dedication: 3/15/05

quippe, quis, quo: see qui
quondam: formerly

quondam
quot: how many; aliquot: several; quotiens: how many times

aliquot, cryptoquote, IQ, misquotation, misquote, Q rating, quota, quotable, quotation, quotative, quote, quoter, quoteworthy, quotidian, quotient, quotity, quotum, unquotable, unquoted
R

rabies: ferocity, madness; rabio: to rave, be mad

enrage, enragement, rabid, rabidity, rabidly, rabidness, rabies, rage, rageful, rageless

possibly rail (v), raillery (W3, OED uncertain: ragere: to babble)
racemus: a cluster of grapes

raceme, racemic, racemiform, racemose, raisin, raisiny

radius: ray

beta ray, biradial, biradiate, CB radio, diradiation, endoradiosonde, eradiate, eradiation, gamma ray, hexiradiate, interradial, irradiance, irradiancy, irradiant, irradiate, irradiation, irradiative, irradiator, laser, laserprint, microradiography, microray, multiradiate, nonradioactive, octoradial, pauciradiate, perradial, perradiate, perradius, quadriradiate, radar, radarbeam, radar dish, radarscope, radial, radially, radial tire, radian, radiance, radiancy, radiant, radiantly, radiata, radiate, radiately, radiatiform, radiation, radiational, radiation burn, radiation sickness, radiative, radiator, radiesthesia, radio, radioactivation, radioactive, radioactivity, radio aerial, radio amateur, radio announcer, radio antenna, radioastronomy, radiobiology, radio blackout, radio broadcast, radiocamera, radiocarbon, radiocast, radiochemical, radiochemistry, radio dating, radio density, radio diagnosis, radio dial, radio ecology, radio emission, radiofrequency, radio galaxy, radiogenetics, radiogenic, radiogram, radiograph, radiographer, radiographic, radiography, radio ham, radioimmunology, radioisotope, radio-label, radiolarian, radiolarite, radiole, radioless, radio license, radiolite, radiolocation, radiologic, radiological, radiologist, radiology, radiolucency, radiolucuent, radioluminescent, radiolysis, radioman, radio message, radiometal, radiometer, radiometric, radiometry, radio-muscular, radionic, radio-operator, radiopage, radiopager, radiopaque, radiophare, radiophone, radiophonic, radiophony, radiophoto, radiophotography, radio protector, radio receiver, radioreceptor, radio resistant, radioscopy, radiosensitive, radioshack, radio signal, radio silence, radiosonde, radio sounder, radiospectrum, radiostation, radiosterilization, radio surgery, radiotelegram, radiotelegraph, radiotelephone, radiotelephony, radio telescope, radiotherapeutic, radiotherapy, radiothermy, radiothon, radiotoxic, radiotoxicity, radio transmission, radio transmitter, radiovision, radio wave, radium, radius, radome, radon, radurization, radwaste, ray, rayon, sexradiate, sun ray, superradiance, superradiant, triradial, triradiate, triradius, xeroradiography, x-ray

N.B. Array and disarray are not derived from radius.