Word origins

• retinervedHaving reticulated veins.
• retractateTo retract; to recant.
• retractationretraction (of something previously said)
• retrahensA muscle that draws the ear backward.
• retraxitA dismissal with prejudice based on a plaintiff's withdrawal of the suit.
• retributoryOf or relating to retribution; of the nature of retribution; involving retribution or repayment.
• retrimentrefuse; dregs
• retro-Back or backward.
• retrocedeTo grant back.
• retroduceTo employ retroduction
• retroductionSynonym of abduction.
• retrofractBent sharply back, so as to appear broken.
• retrogressTo return to an earlier, simpler or worse condition; to regress.
• retromingentAn animal that urinates backwards, such as the camel, hippo or raccoon.
• retropulsiveThat drives or forces back; repelling or repellant.
• retrorseCurved, pointed or oriented backward or downward.
• retroverseArranged in a backwards or reverse manner.
• retrovertTo turn back; to return to a previous state.
• retrudeTo thrust back.
• retruseThrust backward; retruding.
• retrusionThe act of retruding, or the state of being retruded.
• retundTo blunt; to make less sharp.
• revelateTo reveal.
• revellentCausing revulsion; revulsive.
• reverencyReverence.
• revestiaryThe storage space or room in a church or temple where the vestments etc. are kept.
• revictionrevival (return to life, usually figuratively)
• revigorateTo give new vigour to.
• revinceTo overcome.
• revirescenceA growing green or fresh again
• revivificateTo revive; to revivify.
• reviviscentAble or disposed to revive; reviving.
• revocateTo recall (troops, objects, etc)
• revocatoryOf or pertaining to revocation; revocative; tending to revoke or recall.
• revolubleCapable of revolving.
• revulseTo pull back with force.
• rex iustusA righteous king, whose power is regarded as stemming from his piety etc.
• rex sacrorumA senatorial priesthood in Ancient Rome, reserved for patricians.
• rhabdomancyDivination with wands or rods, especially to use a divining rod to find things below the ground.
• RhacotisA city in Egypt near Alexandria.
• rhaetiziteA variety of the mineral kyanite.
• Rhaeto-RomanceA group of related Romance languages spoken in north and north-eastern Italy and southeastern Switzerland, or any of these languages individually.
• rhaponticThe false rhubarb (Rheum rhaponticum)
• rhaponticinechrysophanic acid
• RhazesA Persian polymath and physician of the eighth and ninth centuries; Abū Bakr Muḥammad ibn Zakariyyā al-Rāzī.
• rhedariumA structure used for storage, sale, or manufacture of horse-drawn carriages.
• rheic acidAn acid found in rhubarb; rhein.
• rhetoricateTo use rhetorical tropes or embellishments.
• rhetorolectA type of discourse that has a characteristic configuration of topics, themes, and arguments.
• rhinitis medicamentosaInflammation of the nasal mucosa caused by the overuse of topical nasal decongestants.
• rhinocerotThe rhinoceros.
• rhinotillexisThe act or habit of nose-picking.
• rhombicuboctahedronAn Archimedean solid with eight triangular and eighteen square faces; the small rhombicuboctahedron.
• rhomboidesA rhomboid.
• rhomboideumThe ligament that joins the sternal end of the clavicle with the cartilage of the first rib.
• rhonchisonantMaking a snorting noise; snorting.
• rhonchusA dry rattling sound heard during breathing, due to deposits in the bronchial tubes.
• rhopalicHaving each successive word longer by a letter or syllable.
• ricinicPertaining to, or derived from, castor oil.
• ricinineAn alkaloid extracted from the seeds of the castor oil plant, chemical formula C₈H₈N₂O₂
• riciniumA mantle worn, mainly by women, in Ancient Rome.
• ricinoleinThe glyceride of ricinoleic acid, present in castor oil.
• rictusA bird’s gaping mouth.
• ridentlaughing
• rigationirrigation
• rigescentBecoming stiff or numb.
• right angleHalf of the angle formed by a single straight line, equivalent to 90 degrees.
• rigoristSomeone who takes the strictest interpretation of a law, religious injunction etc.
• rimoseHaving a surface covered with cracks, fissures, or crevices.
• rimuliformcrack-shaped
• ringentHaving the semblance of lips parted wide, such as may be observed in certain flowers.
• ripariousGrowing or living along the banks of rivers
• RiphaeanDesignating a range of mountains once thought to be located in northern Europe, later considered mythological or identified with the Urals.
• RipuarianAny of the Ripuarian tribal section of the Frank people (comprising several tribes), who after some migration inhabited this region, as opposed to the Salian branch.
• risorialPertaining to, or producing, laughter.
• rivalityrivalry; competition
• rivaroxabanAn anticoagulant drug C₁₉H₁₈ClN₃O₅S (trademark Xarelto) that inhibits the activity of factor X and is taken orally especially to prevent and treat deep vein thrombosis and pulmonary embolism and to reduce the risk of stroke related to atrial fibrillation.
• rivoseMarked with sinuate and irregular furrows.
• rivuloseMarked by thin, winding or crooked lines.
• rixationScolding; brawling.
• rixyquarrelsome
• roborantSynonym of strengthening or restorative.
• roborateSynonym of confirm, to verify, to establish.
• roborativeSynonym of roborant: strengthening, invigorating, or restorative.
• roboreanSynonym of oaken, made of oak or similar wood.
• roboreousSynonym of oaken, made of oak wood.
• Robur CarolinumA former constellation in the Southern Hemisphere now forming parts of Vela and Carina.
• rock oilNaphtha (liquid petroleum).
• rogationA deeply serious and somber prayer or entreaty.
• rogitateTo ask a question repeatedly.
• RomaeanOf or pertaining to the Eastern Roman Empire, that is, to the Byzantine Empire.
• RománicoAn artificial language composed of regularized source words common to the major Romance languages, created in 1991. It is closely related to Esperanto and Ido.
• RomanityThe quality of being part of the Roman world and living according to Roman customs.
• roralRelating to dew; dewy.
• rorationSynonym of dewfall.
• roredew
• roricResembling, pertaining to, or containing dew; dewy.
• roridDewy; containing dew.
• roriferousProducing or generating dew.
• rorifluentflowing with dew