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- RETICULEA reticle; a grid in the eyepiece of an instrument.
- RETICULUMA network. For example, the endoplasmic reticulum forms a network of cellular components that functions as a transportation system within the cell.
- RETINACULUM(Can we clean up this sense?) A connecting band.
- RETINULAOne of the group of pigmented cells that surround the retinophorae of invertebrates.
- RETIRETo stop working on a permanent basis, usually because of old age or illness.
- RETRACTTo pull (something) back or back inside.
- RETREATThe act of pulling back or withdrawing, as from something dangerous, or unpleasant. The act of reversing direction and receding from a forward position. Withdrawal by a military fo
- RETUNDTo blunt; to make less sharp.
- REVEALThe outer side of a window or door frame.
- REVELAn instance of merrymaking; a celebration.
- REVELATIONThe act of revealing or disclosing.
- REVESTTo dress (a priest or other religious figure) in ritual garments, especially to celebrate Mass or another service.
- REVIEWA second or subsequent reading of a text or artifact in an attempt to gain new insights.
- REVISETo review, alter and amend, especially of written material.
- REVISIONThe process of revising: The action or process of reviewing, editing and amending. The action or process of reviewing something previously learned, especially one′s notes in prepar
- REVISITTo visit again.
- REVOCABLEHaving the ability of being revoked; capable of being revoked.
- REVOCATIONAn act or instance of revoking.
- REVOKETo cancel or invalidate by withdrawing or reversing.
- REVOLTTo rebel, particularly against authority.
- REVOLUTERolled or recurved on itself.
- REVOLUTIONA political upheaval in a government or state characterized by great change.
- REVULSIONAbhorrence, a sense of loathing, intense aversion, repugnance, repulsion, horror.
- RHENIUMA metallic chemical element with the atomic number 75: a heavy, silvery-gray transition metal.
- RHINOCERIplural of rhinoceros
- RHOMBOIDESA rhomboid.
- RHOMBOIDEUSAny of the rhomboid muscles.
- RICINAn extremely toxic lectin extracted from the castor bean.
- RICINSAn extremely toxic lectin extracted from the castor bean.
- RICOTTAA soft Italian unsalted whey cheese resembling cottage cheese.
- RICTUSA bird’s gaping mouth.
- RIDENTlaughing
- RIDICULETo criticize or disapprove of someone or something through scornful jocularity; to make fun of.
- RIDICULOUSDeserving of ridicule; foolish, absurd.
- RIGIDStiff, rather than flexible.
- RIGORUS spelling of rigour.
- RIGORISTSomeone who takes the strictest interpretation of a law, religious injunction etc.
- RIGOROUSShowing, causing, or favoring rigour/rigor; scrupulously accurate or strict; thorough.
- RIMAA cleft or gap between two symmetrical parts, particularly between the vocal folds.
- RIMOSEHaving a surface covered with cracks, fissures, or crevices.
- RIOTA tumultuous disturbance of the public peace by a large group of people, often involving violence or damage to property.
- RIPARIANOf or relating to the bank of a river or stream.
- RISIBLEOf or pertaining to laughter.
- RITEA religious custom.
- RITUALRelated to a rite or repeated set of actions.
- RIVAGEA coast, a shore.
- RIVALA competitor (person, team, company, etc.) with the same goal as another, or striving to attain the same thing. Defeating a rival may be a primary or necessary goal of a competitor
- RIVALITYrivalry; competition
- RIVETA cylindrical mechanical fastener which is supplied with a factory head at one end and is used to attach multiple parts together by passing its bucktail through a hole and upsettin
- RIVULETA small stream; a streamlet; a gill.
- RIVULOSEMarked by thin, winding or crooked lines.
- ROBUSTAble to withstand adverse conditions.
- ROBUSTAAny plant of the species Coffea canephora of coffee plants, native to Africa, cultivated widely in Brazil.
- ROCKA formation of minerals, specifically: The naturally occurring aggregate of solid mineral matter that constitutes a significant part of the earth's crust.
- ROCKYAbounding in, or full of, rocks; consisting of rocks.
- RODENTA mammal of the order Rodentia, characterized by long incisors that grow continuously and are worn down by gnawing.
- ROGATIONA deeply serious and somber prayer or entreaty.
- ROILTo render turbid by stirring up the dregs or sediment of.
- ROISTERTo engage in noisy, drunken, or riotous behaviour.
- ROLEA character or part played by a performer or actor.
- ROLLTo revolve by turning over and over; to move by turning on a horizontal axis; to impel forward with a revolving motion on a supporting surface.
- ROMALA long quirt attached to the end of a set of closed reins that are connected to the bridle of a horse, and used to assist in moving cattle.
- ROMANCEAn intimate relationship between two people; a love affair.
- ROMANTICOf a work of literature, a writer etc.: being like or having the characteristics of a romance, or poetic tale of a mythic or quasi-historical time; fantastic.
- RONDELA metric form of verse using two rhymes, usually fourteen 8- to 10-syllable lines in three stanzas, with the first lines of the first stanza returning as refrain of the next two.
- RORIDDewy; containing dew.
- ROSACEAA chronic condition characterized by redness of the face.
- ROSACEOUSOf or relating to a rose, or a member of the Rosaceae family of plants.
- ROSCIDContaining or consisting of dew; dewy.
- ROSEATELike the rose flower; pink; rosy.
- ROSEMARYA shrub, Salvia rosmarinus (formerly Rosmarinus officinalis), that originates from Europe and Asia Minor and produces a fragrant herb used in cooking and perfumes.
- ROSEOLAA rosy rash occurring in measles, typhoid fever, syphilis and some other diseases.
- ROSULATEArranged in small rose-like clusters.
- ROTAA schedule that allocates some task, responsibility or (rarely) privilege between a set of people according to a (possibly periodic) calendar.
- ROTALOf or relating to wheels.
- ROTATETo spin, turn, or revolve.
- ROTATIONThe act of turning around a centre or an axis.
- ROTEMechanical routine; a fixed, habitual, repetitive, or mechanical course of procedure.
- ROTULAThe patella; the kneecap.
- ROTUNDAA round building, usually small, often with a dome.
- ROTUNDITYThe quality of being rotund.
- ROUGEOf a reddish pink colour.
- ROUNCYA horse, especially a common riding-horse.
- ROUNDrounding function
- ROUTEA course or way which is traveled or passed.
- ROUTINEA course of action to be followed regularly; a standard procedure.
- ROWELA small spiked wheel on the end of a spur of certain types.
- ROYALOf or relating to a monarch or his (or her) family.
- RUANAAn outer garment typical of the Andes region of Venezuela and Colombia, and resembling a poncho.
- RUBEFACIENTMaking red.
- RUBESCENTturning red; reddening
- RUBICUNDPossessing a red complexion; ruddy.
- RUBIDIUMThe chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.
- RUBINEA reddish aniline dye.
- RUBUSAny of the genus Rubus of flowering plants, including the raspberry and blackberry.
- RUBYA clear, deep, red variety of corundum, valued as a precious stone.
- RUCKUSA raucous disturbance and/or commotion.
- RUDELacking in refinement or civility; bad-mannered; discourteous.
- RUDERALAny plant growing in rubbish or very poor soil.
- RUDESLacking in refinement or civility; bad-mannered; discourteous.