| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
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| ametropia | (noun) (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia | - |
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| ametropic | (adjective) of or relating to an abnormal condition of the eye in which visual images are not in focus on the retina | - |
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| anisometropia | (noun) difference in the refractive power of the two eyes | - |
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| anisometropic | (adjective) relating to a difference in the refractive power of the two eyes | - |
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| beetroot | (noun) round red root vegetable | Synonyms: beet |
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| (noun) beet having a massively swollen red root; widely grown for human consumption | Synonyms: Beta vulgaris rubra |
| betroth | (verb) give to in marriage | Synonyms: affiance, engage, plight |
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| betrothal | (noun) the act of becoming betrothed or engaged | Synonyms: espousal |
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| (noun) a mutual promise to marry | Synonyms: engagement, troth |
| betrothed | (adjective) pledged to be married | Synonyms: bespoken, engaged |
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| (noun) the person to whom you are engaged | - |
| dimetrodon | (noun) carnivorous dinosaur of the Permian in North America having a crest or dorsal sail | - |
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| emmetropia | (noun) (ophthalmology) the normal refractive condition of the eye in which there is clear focus of light on the retina | - |
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| emmetropic | (adjective) of or relating to the normal condition of the eye in which visual images are in clear focus on the retina | - |
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| globetrotter | (noun) someone who travels widely and often | Synonyms: world traveler |
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| hypermetropia | (noun) abnormal condition in which vision for distant objects is better than for near objects | Synonyms: farsightedness, hypermetropy, hyperopia, longsightedness |
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| hypermetropic | (adjective) abnormal ability to focus of distant objects | Synonyms: hyperopic |
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| hypermetropy | (noun) abnormal condition in which vision for distant objects is better than for near objects | Synonyms: farsightedness, hypermetropia, hyperopia, longsightedness |
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| isometropia | (noun) equality of refractive power in the two eyes | - |
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| ketotetrose | (noun) A monosaccharide that has both a ketone and four carbons. | - |
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| magnetron | (noun) a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators | - |
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| metro | (noun) an electric railway operating below the surface of the ground (usually in a city) | Synonyms: subway, subway system, tube, underground |
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| metrological | (adjective) of or relating to metrology | - |
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| metrology | (noun) the scientific study of measurement | - |
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| metronidazole | (noun) antiprotozoal medication (trade name Flagyl) used to treat trichomoniasis and giardiasis | Synonyms: Flagyl |
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| metronome | (noun) clicking pendulum indicates the exact tempo of a piece of music | - |
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| metronymic | (noun) a name derived from the name of your mother or a maternal ancestor | Synonyms: matronymic |
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| metropolis | (noun) people living in a large densely populated municipality | Synonyms: city |
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| (noun) a large and densely populated urban area; may include several independent administrative districts | Synonyms: city, urban center |
| metropolitan | (adjective) relating to or characteristic of a metropolis | - |
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| (noun) a person who lives in a metropolis | - |
| (noun) in the Eastern Orthodox Church this title is given to a position between bishop and patriarch; equivalent to archbishop in western Christianity | - |
| metroptosis | (noun) prolapse of the uterus | Synonyms: descensus uteri |
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| metrorrhagia | (noun) bleeding from the uterus that is not due to menstruation; usually indicative of disease (as cervical cancer) | - |
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| metrosexual | (adjective) a heterosexual man that is particularly interested in his appearance, being well-groomed and fashion | - |
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| osteopetrosis | (noun) an inherited disorder characterized by an increase in bone density; in severe forms the bone marrow cavity may be obliterated | Synonyms: Albers-Schonberg disease, marble bones disease |
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| petrochemical | (noun) any compound obtained from petroleum or natural gas | - |
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| petroglyph | (noun) a carving or line drawing on rock (especially one made by prehistoric people) | - |
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| petrol | (noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines | Synonyms: gas, gasolene, gasoline |
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| petrolatum | (noun) a semisolid mixture of hydrocarbons obtained from petroleum; used in medicinal ointments and for lubrication | Synonyms: mineral jelly, petroleum jelly |
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| petroleum | (noun) a dark oil consisting mainly of hydrocarbons | Synonyms: crude, crude oil, fossil oil, oil, rock oil |
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| petrology | (noun) the branch of geology that studies rocks: their origin and formation and mineral composition and classification | Synonyms: lithology |
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| petrous | (adjective) (of bone especially the temporal bone) resembling stone in hardness | Synonyms: stonelike |
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| retro | (adjective) affecting things past | Synonyms: ex post facto, retroactive |
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| (noun) a fashion reminiscent of the past | - |
| retroactive | (adjective) descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously | - |
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| (adjective) affecting things past | Synonyms: ex post facto, retro |
| retroactively | (adverb) after the fact | - |
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| retrofit | (noun) the act of adding a component or accessory to something that did not have it when it was manufactured | - |
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| (noun) a component or accessory added to something after it has been manufactured | - |
| (verb) substitute new or modernized parts or equipment for older ones | - |
| (verb) fit in or on an existing structure, such as an older house | - |
| (verb) provide with parts, devices, or equipment not available or in use at the time of the original manufacture | - |
| retroflection | (noun) the act of bending backward | Synonyms: retroflexion |
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| (noun) an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth | Synonyms: retroflexion |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflexion, retroversion |
| retroflex | (adjective) bent or curved backward | Synonyms: retroflexed |
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| (adjective) pronounced with the tip of the tongue turned back toward the hard palate | Synonyms: cacuminal |
| (verb) articulate (a consonant) with the tongue curled back against the palate | - |
| (verb) bend or turn backward | Synonyms: replicate |
| retroflexed | (adjective) bent or curved backward | Synonyms: retroflex |
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| retroflexion | (noun) the act of bending backward | Synonyms: retroflection |
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| (noun) an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth | Synonyms: retroflection |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflection, retroversion |
| retrogaming | (noun) The hobby of playing or collecting older video games and computer games. | - |
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| retrograde | (adjective) of amnesia; affecting time immediately preceding trauma | - |
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| (adjective) moving from east to west on the celestial sphere; or--for planets--around the sun in a direction opposite to that of the Earth | - |
| (adjective) going from better to worse | Synonyms: retrogressive |
| (adjective) moving or directed or tending in a backward direction or contrary to a previous direction | Synonyms: retral |
| (verb) get worse or fall back to a previous condition | Synonyms: regress, retrogress |
| (verb) go back over | Synonyms: hash over, rehash |
| (verb) move back | Synonyms: retreat |
| (verb) move in a direction contrary to the usual one | - |
| (verb) move backward in an orbit, of celestial bodies | - |
| retrogress | (verb) go back to bad behavior | Synonyms: fall back, lapse, recidivate, regress, relapse |
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| (verb) get worse or fall back to a previous condition | Synonyms: regress, retrograde |
| retrogression | (noun) returning to a former state | Synonyms: regress, regression, retroversion, reversion |
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| (noun) passing from a more complex to a simpler biological form | Synonyms: degeneration |
| retrogressive | (adjective) going from better to worse | Synonyms: retrograde |
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| retronym | (noun) a word introduced because an existing term has become inadequate | - |
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| retrorocket | (noun) a small rocket engine on a larger rocket or spacecraft that is fired to slow or alter its course | - |
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| retrorse | (adjective) bent or curved backward or downward | - |
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| retrospect | (noun) contemplation of things past | - |
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| (verb) look back upon (a period of time, sequence of events); remember | Synonyms: look back, review |
| retrospection | (noun) memory for experiences that are past | - |
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| (noun) reference to things past | - |
| retrospective | (adjective) concerned with or related to the past | - |
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| (noun) an exhibition of a representative selection of an artist's life work | - |
| retrospectively | (adverb) in a manner contemplative of past events | - |
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| retrousse | (adjective) (used of noses) turned up at the end | Synonyms: tip-tilted, upturned |
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| retroversion | (noun) returning to a former state | Synonyms: regress, regression, retrogression, reversion |
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| (noun) translation back into the original language | - |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflection, retroflexion |
| retrovert | (verb) go back to a previous state | Synonyms: regress, return, revert, turn back |
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| retrovirus | (noun) any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell | - |
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| retrovision | (noun) a vision of events in the distant past | - |
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| tetrode | (noun) a thermionic tube having four electrodes | - |
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| tetrodotoxin | (noun) a powerful neurotoxin found in the ovaries of pufferfish | - |
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| tetrose | (noun) any monosaccharide sugar containing four atoms of carbon per molecule | - |
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| tetroxide | (noun) an oxide containing four atoms of oxygen in the molecule | - |
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| thermometrograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermograph |
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