| betray | (verb) give away information about somebody | Synonyms: denounce, give away, grass, rat, shit, shop, snitch, stag, tell on |
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| (verb) reveal unintentionally | Synonyms: bewray |
| (verb) cause someone to believe an untruth | Synonyms: deceive, lead astray |
| (verb) disappoint, prove undependable to; abandon, forsake | Synonyms: fail |
| (verb) deliver to an enemy by treachery | Synonyms: sell |
| (verb) be sexually unfaithful to one's partner in marriage | Synonyms: cheat, cheat on, cuckold, wander |
| betrayal | (noun) an act of deliberate betrayal | Synonyms: perfidy, treachery, treason |
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| (noun) the quality of aiding an enemy | - |
| betrayer | (noun) a person who says one thing and does another | Synonyms: double-crosser, double-dealer, traitor, two-timer |
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| (noun) one who reveals confidential information to the police or other authority | Synonyms: blabber, informer, rat, squealer |
| chlortetracycline | (noun) a yellow crystalline antibiotic (trade name Aureomycin) used to treat certain bacterial and rickettsial diseases | Synonyms: Aureomycin |
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| detract | (verb) take away a part from; diminish | Synonyms: take away |
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| detraction | (noun) the act of discrediting or detracting from someone's reputation (especially by slander) | - |
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| (noun) a petty disparagement | Synonyms: petty criticism |
| detractive | (adjective) causing to decrease in importance or value | - |
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| detractor | (noun) one who disparages or belittles the worth of something | Synonyms: depreciator, disparager, knocker |
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| detrain | (verb) leave a train | - |
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| detransitivise | (verb) intransitivize | Synonyms: detransitivize, intransitivise, intransitivize |
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| detransitivize | (verb) intransitivize | Synonyms: detransitivise, intransitivise, intransitivize |
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| diametral | (adjective) related to or along a diameter | Synonyms: diametric, diametrical |
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| firetrap | (noun) a building that would be hard to escape from if it were to catch fire | - |
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| haematocolpometra | (noun) accumulation of blood in the vagina and uterus | Synonyms: hematocolpometra |
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| hematocolpometra | (noun) accumulation of blood in the vagina and uterus | Synonyms: haematocolpometra |
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| hydroxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: oxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| icetray | (noun) a tray for making cubes of ice in a refrigerator | - |
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| impenetrability | (noun) the quality of being impenetrable (by people or light or missiles etc.) | Synonyms: imperviousness |
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| (noun) incomprehensibility by virtue of being too dense to understand | Synonyms: impenetrableness |
| impenetrable | (adjective) not admitting of penetration or passage into or through | - |
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| (adjective) impossible to understand | - |
| (adjective) permitting little if any light to pass through because of denseness of matter | Synonyms: dense, heavy |
| impenetrableness | (noun) incomprehensibility by virtue of being too dense to understand | Synonyms: impenetrability |
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| interpenetrate | (verb) penetrate mutually or be interlocked | Synonyms: permeate |
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| (verb) spread or diffuse through | Synonyms: diffuse, imbue, penetrate, permeate, pervade, riddle |
| interpenetration | (noun) mutual penetration; diffusion of each through the other | Synonyms: permeation |
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| (noun) the action of penetrating between or among | - |
| kilometrage | (noun) the number of kilometres travelled by a vehicle. | - |
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| metralgia | (noun) pain in the uterus | - |
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| mousetrap | (noun) (American football) a play in which a defensive player is allowed to cross the line of scrimmage and then blocked off as the runner goes through the place the lineman vacated | Synonyms: trap play |
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| (noun) a trap for catching mice | - |
| nonretractable | (adjective) not capable of being retracted | Synonyms: nonretractile |
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| nonretractile | (adjective) not capable of being retracted | Synonyms: nonretractable |
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| oxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: hydroxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| penetrability | (noun) the quality of being penetrable (by people or light or missiles etc.) | Synonyms: perviousness |
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| penetrable | (adjective) admitting of penetration or passage into or through | - |
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| (adjective) capable of being penetrated | - |
| penetralium | (noun) the innermost parts | - |
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| penetrate | (verb) come to understand | Synonyms: bottom, fathom |
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| (verb) become clear or enter one's consciousness or emotions | Synonyms: click, come home, dawn, fall into place, get across, get through, sink in |
| (verb) pass into or through, often by overcoming resistance | Synonyms: perforate |
| (verb) insert the penis into the vagina or anus of | - |
| (verb) spread or diffuse through | Synonyms: diffuse, imbue, interpenetrate, permeate, pervade, riddle |
| (verb) make one's way deeper into or through | - |
| (verb) enter a group or organization in order to spy on the members | Synonyms: infiltrate |
| penetrating | (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, keen, knifelike, penetrative, piercing, sharp |
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| (adjective) tending to penetrate; having the power of entering or piercing | Synonyms: penetrative |
| penetratingly | (adverb) with ability to see into deeply | Synonyms: penetratively |
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| penetration | (noun) an attack that penetrates into enemy territory | Synonyms: incursion |
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| (noun) the act of entering into or through something | - |
| (noun) the act (by a man) of inserting his penis into the vagina of a woman | - |
| (noun) the depth to which something penetrates (especially the depth reached by a projectile that hits a target) | - |
| (noun) the ability to make way into or through something | - |
| (noun) clear or deep perception of a situation | Synonyms: insight |
| penetrative | (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, keen, knifelike, penetrating, piercing, sharp |
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| (adjective) tending to penetrate; having the power of entering or piercing | Synonyms: penetrating |
| penetratively | (adverb) with ability to see into deeply | Synonyms: penetratingly |
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| penetrator | (noun) an intruder who passes into or through (often by overcoming resistance) | - |
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| pentamethylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentylenetetrazol |
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| pentylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentamethylenetetrazol |
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| perpetrate | (verb) perform an act, usually with a negative connotation | Synonyms: commit, pull |
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| perpetration | (noun) the act of committing a crime | Synonyms: commission, committal |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| polytetrafluoroethylene | (noun) a material used to coat cooking utensils and in industrial applications where sticking is to be avoided | Synonyms: Teflon |
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| racetrack | (noun) a course over which races are run | Synonyms: racecourse, raceway, track |
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| retrace | (verb) reassemble mentally | Synonyms: construct, reconstruct |
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| (verb) to go back over again | Synonyms: trace |
| retract | (verb) formally reject or disavow a formerly held belief, usually under pressure | Synonyms: abjure, forswear, recant, resile |
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| (verb) pull inward or towards a center | Synonyms: draw in |
| (verb) use a surgical instrument to hold open (the edges of a wound or an organ) | Synonyms: draw back, pull back |
| (verb) pull away from a source of disgust or fear | Synonyms: shrink back |
| retractable | (adjective) capable of being retracted | - |
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| retracted | (adjective) drawn back and in | - |
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| retractile | (adjective) capable of retraction; capable of being drawn back | - |
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| retraction | (noun) the act of pulling or holding or drawing a part back | - |
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| (noun) a disavowal or taking back of a previous assertion | Synonyms: abjuration, recantation |
| retractor | (noun) surgical instrument that holds back the edges of a surgical incision | - |
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| retrain | (verb) train again | - |
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| (verb) teach new skills | - |
| retraining | (noun) training for a new occupation | - |
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| retral | (adjective) moving or directed or tending in a backward direction or contrary to a previous direction | Synonyms: retrograde |
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| (adjective) at or near or toward the posterior | - |
| retranslate | (verb) translate again | - |
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| retransmit | (verb) transmit again | - |
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| sidetrack | (noun) a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass | Synonyms: railroad siding, siding, turnout |
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| (verb) wander from a direct or straight course | Synonyms: depart, digress, straggle |
| tetra | (noun) brightly colored tropical freshwater fishes | - |
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| tetracaine | (noun) a crystalline compound used in the form of a hydrochloride as a local anesthetic | - |
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| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetrachloride | (noun) any compound that contains four chlorine atoms per molecule | - |
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| tetrachloroethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachlorethylene |
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| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| tetracycline | (noun) an antibiotic (trade name Achromycin) derived from microorganisms of the genus Streptomyces and used broadly to treat infections | Synonyms: Achromycin |
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| 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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| tetrafluoroethylene | (noun) a flammable gaseous fluorocarbon used in making plastics (polytetrafluoroethylene resins) | - |
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| tetragen | (noun) any chemical element that belongs to the carbon group. | Synonyms: carbon group element, crystallogen, Group 14 element, tetrel |
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| tetragon | (noun) a four-sided polygon | Synonyms: quadrangle, quadrilateral |
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| tetragonal | (adjective) of or relating to or shaped like a quadrilateral | - |
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| tetragram | (noun) a word that is written with four letters in an alphabetic writing system | - |
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| tetrahalide | (noun) any halide containing four halogen atoms in its molecules | - |
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| tetrahedron | (noun) any polyhedron having four plane faces | - |
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| tetrahydrocannabinol | (noun) psychoactive substance present in marijuana | Synonyms: THC |
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| tetrahymena | (noun) relative of the paramecium; often used in genetics research | - |
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| tetraiodothyronine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, thyroxin, thyroxine |
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| tetralogy | (noun) a series of four related works (plays or operas or novels) | - |
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| tetramerous | (adjective) having or consisting of four similar parts; tetramerous flowers | - |
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| tetrameter | (noun) a verse line having four metrical feet | - |
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| tetramethyldiarsine | (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: cacodyl |
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| tetrametric | (adjective) of or relating to verse lines written in tetrameter | - |
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| tetranychid | (noun) web-spinning mite that attacks garden plants and fruit trees | Synonyms: spider mite |
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| tetrapod | (noun) a vertebrate animal having four feet or legs or leglike appendages | - |
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| tetrasaccharide | (noun) any of a variety of carbohydrates that yield four monosaccharide molecules on complete hydrolysis | - |
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| tetraskele | (noun) a figure consisting of four stylized human arms or legs (or bent lines) radiating from a center | Synonyms: tetraskelion |
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| tetraskelion | (noun) a figure consisting of four stylized human arms or legs (or bent lines) radiating from a center | Synonyms: tetraskele |
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| tetrasporangium | (noun) a sporangium containing four asexual spores | - |
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| tetraspore | (noun) one of the four asexual spores produced within a sporangium | - |
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| tetravalent | (adjective) having a valence of four | - |
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| triquetral | (noun) a wrist bone that articulates with the pisiform and hamate and lunate bones | Synonyms: cuneiform bone, os triquetrum, pyramidal bone, triquetral bone |
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