| radix | (noun) (numeration system) the positive integer that is equivalent to one in the next higher counting place | Synonyms: base |
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| radome | (noun) a housing for a radar antenna; transparent to radio waves | Synonyms: radar dome |
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| radon | (noun) a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health | Synonyms: atomic number 86, Rn |
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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 | - |
| sporadic | (adjective) recurring in scattered and irregular or unpredictable instances | - |
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| sporadically | (adverb) in a sporadic manner | Synonyms: periodically |
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| sporadicalness | (noun) The quality of being rare and scattered in occurrence. | - |
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| steradian | (noun) the unit of solid angle adopted under the Systeme International d'Unites | Synonyms: sr |
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| straddle | (noun) the act of sitting or standing astride | Synonyms: span |
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| (noun) the option to buy or sell a given stock (or stock index or commodity future) at a given price before a given date; consists of an equal number of put and call options | - |
| (noun) a gymnastic exercise performed with a leg on either side of the parallel bars | - |
| (noun) a noncommittal or equivocal position | - |
| (verb) be noncommittal | - |
| (verb) sit or stand astride of | - |
| (verb) range or extend over; occupy a certain area | Synonyms: range |
| taradiddle | (noun) a trivial lie | Synonyms: fib, story, tale, tarradiddle |
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| (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, tarradiddle, tommyrot, tosh, twaddle |
| tardigrade | (noun) an arthropod of the division Tardigrada | - |
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| tarradiddle | (noun) a trivial lie | Synonyms: fib, story, tale, taradiddle |
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| (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, taradiddle, tommyrot, tosh, twaddle |
| tetrad | (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity |
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| tirade | (noun) a speech of violent denunciation | Synonyms: broadside, philippic |
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| trad | (noun) traditional jazz as revived in the 1950s | - |
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| trade | (noun) the skilled practice of a practical occupation | Synonyms: craft |
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| (noun) the business given to a commercial establishment by its customers | Synonyms: patronage |
| (noun) a particular instance of buying or selling | Synonyms: business deal, deal |
| (noun) an equal exchange | Synonyms: barter, swap, swop |
| (noun) the commercial exchange (buying and selling on domestic or international markets) of goods and services | - |
| (noun) people who perform a particular kind of skilled work | Synonyms: craft |
| (noun) steady winds blowing from east to west above and below the equator | Synonyms: trade wind |
| (verb) turn in as payment or part payment for a purchase | Synonyms: trade in |
| (verb) engage in the trade of | Synonyms: merchandise |
| (verb) exchange or give (something) in exchange for | Synonyms: swap, switch, swop |
| (verb) do business; offer for sale as for one's livelihood | Synonyms: deal, sell |
| (verb) be traded at a certain price or under certain conditions | - |
| tradecraft | (noun) skill acquired through experience in a trade; often used to discuss skill in espionage | - |
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| trademark | (noun) a distinctive characteristic or attribute of someone or something | Synonyms: earmark, hallmark, stylemark |
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| (noun) a formally registered symbol identifying the manufacturer or distributor of a product | - |
| (verb) register the trademark of | - |
| (verb) mark with a brand or trademark | Synonyms: brand, brandmark |
| trademarked | (adjective) (of goods and merchandise) labeled with proprietary (and legally registered) identification guaranteeing exclusive use | - |
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| tradeoff | (noun) an exchange that occurs as a compromise | Synonyms: trade-off |
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| trader | (noun) someone who purchases and maintains an inventory of goods to be sold | Synonyms: bargainer, dealer, monger |
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| tradesman | (noun) a merchant who owns or manages a shop | Synonyms: market keeper, shopkeeper, storekeeper |
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| tradespeople | (noun) people engaged in trade | - |
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| trading | (noun) buying or selling securities or commodities | - |
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| tradition | (noun) an inherited pattern of thought or action | - |
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| (noun) a specific practice of long standing | Synonyms: custom |
| traditional | (adjective) consisting of or derived from tradition | - |
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| (adjective) pertaining to time-honored orthodox doctrines | - |
| traditionalism | (noun) adherence to tradition (especially in cultural or religious matters) | - |
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| (noun) strict adherence to traditional methods or teachings | Synonyms: traditionality |
| (noun) the doctrine that all knowledge was originally derived by divine revelation and that it is transmitted by traditions | - |
| traditionalist | (adjective) stubbornly conservative and narrow-minded | Synonyms: hidebound |
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| (noun) one who adheres to traditional views | Synonyms: diehard |
| traditionalistic | (adjective) adhering to tradition especially in cultural or religious practices | - |
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| traditionality | (noun) strict adherence to traditional methods or teachings | Synonyms: traditionalism |
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| traditionally | (adverb) according to tradition; in a traditional manner | - |
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| traduce | (verb) speak unfavorably about | Synonyms: badmouth, drag through the mud, malign |
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| traducement | (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumniation, calumny, defamation, hatchet job, obloquy |
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| traducer | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, defamer, libeler, maligner, slanderer, vilifier |
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| undergrad | (noun) a university student who has not yet received a first degree | Synonyms: undergraduate |
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| undergraduate | (noun) a university student who has not yet received a first degree | Synonyms: undergrad |
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| ungraded | (adjective) not arranged in order hierarchically | Synonyms: unordered, unranked |
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| (adjective) (of roads) not leveled or drained; unsuitable for all year travel | Synonyms: dirt |
| untraditional | (adjective) not conforming to or in accord with tradition | Synonyms: nontraditional |
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| upgrade | (noun) the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components) | - |
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| (noun) hardware that provides better performance than an earlier version did | - |
| (noun) the property possessed by a slope or surface that rises | Synonyms: rise, rising slope |
| (noun) a reservation that is improved | - |
| (noun) software that provides better performance than an earlier version did | - |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, ascent, climb, raise, rise |
| (verb) to improve what was old or outdated | - |
| (verb) give better travel conditions to | - |
| (verb) get better travel conditions | - |
| (verb) rate higher; raise in value or esteem | - |
| (verb) give a promotion to or assign to a higher position | Synonyms: advance, elevate, kick upstairs, promote, raise |
| xeroradiography | (noun) radiography using X-rays and xerographic (rather than roentgenographic) techniques | - |
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