Dedication: 3/15/05

quartus (fourth): see quattuor
quasi: as if

quasar, quasi, quasi-classical, quasi-contract, quasi fission, Quasimodo, quasi-normal, quasi particle, quasi-public, quasistellar

quatio, quassum: shake

cashier (vb), cassation, concussion, concussive, discuss, discussant, discusser, discissible, discussion, discussional, discussionist, discussive, discutient, percuss, percussant, percussion, percussive, percussively, percussor, quash, quassation, repercuss, repercussion, repercussive, rescue, rescuer, seaquake, squash (game), squash (vb), succuss, sucussatory, succussion, undiscussed

OED rejects cascara.
quattuor: four; quartus: fourth

biquadrate, biquadratic, cadre, carfax, carillon, chi-square, escadrille, forequarter, foursquare, headquarter, hindquarter, interquartile, number square, one-quarter, perfect square, quad, quadrable, quadragenarian, quadragenary, quadragesima, quadragesimal, quadrangle, quadrangular, quadrant, quadrantal, quadrantic, quadrantid, quadraphonic, quadraphony, quadrasonic, quadrat, quadrate, quadratic, quadratics, quadratojugal, quadratrix, quadrature, quadratus, quadrennial, quadrennium, quadric, quadriceps, quadricorn, quadricostate, quadricycle, quadridentate, quadridigitate, quadrifid, quadrifilar, quadrifoliate, quadriform, quadriga, quadrigamist, quadrigamy, quadrijugal, quadrilateral, quadrilingual, quadriliteral, quadrille, quadrillion, quadrinomial, quadriparous, quadripartite, quadripennate, quadriplegia, quadriplegic, quadripole, quadriradiate, quadrireme, quadrisect, quadrisyllabic, quadrivalence, quadrivalency, quadrivalent, quadrivalve, quadrivial, quadrivium, quadrivoltine, quadro, quadromanous, quadroon, quadrucorn, quadrumana, quadrumanous, quadrumvirate, quadruped, quadrupedal, quadruplane, quadruple, quadrupler, quadruplet, quadruplex, quadruplicate, quadruplicator, quadruplication, quadruplicative, quadruplicity, quadruply, quadrupole, quarantinable, quarantine, quarrier, quarry (rock), quarryman, quart, quartal, quartan, quartation, quarter, quarterback, quarterbarrel, quartercentary, quartercentury, quarterday, quarterdeck, quarterer, quarterfinal, quatergallery, quartergrain, quartergunner, quarterhorse, quarterline, quarterlight, quarterly, quartermaster, quartermile, quatermoon, quartern, quarternary, quartersection, quartersessions, quarterstaff, quarterwave, quartet, quartic, quartile, quartine, quarto, quatercentenary, quatercentennial, quatern, quaternary, quaternate, quaternion, quaternity, quaternize, quatorzain, quatorze, quatrain, quatrefoil, quatro, quattrocento, quire, squad, squad-leader, squadron, squarable, square, square dance, Square Deal, squarely, squareness, square off, squarer, square sail, square shooter, square toed, squary, T square, third-quarter, three quarter, taxi squad, trisquare, winter quarters, word square