| animatronics | (noun) the construction of robots to look like animals (developed for Disneyland) | - |
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| antielectron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: positron |
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| antineutron | (noun) the antiparticle of a neutron | - |
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| astronaut | (noun) a person trained to travel in a spacecraft | Synonyms: cosmonaut, spaceman |
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| astronautics | (noun) the theory and practice of navigation through air or space | Synonyms: aeronautics |
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| astronavigation | (noun) navigating according to the positions of the stars | Synonyms: celestial navigation |
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| astronomer | (noun) a physicist who studies astronomy | Synonyms: stargazer, uranologist |
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| astronomy | (noun) the branch of physics that studies celestial bodies and the universe as a whole | Synonyms: uranology |
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| betatron | (noun) accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux | Synonyms: induction accelerator |
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| bevatron | (noun) a cyclotron that accelerates protons up to several billion electron volts | - |
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| cistron | (noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Synonyms: factor, gene |
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| citron | (noun) large lemonlike fruit with thick aromatic rind; usually preserved | - |
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| (noun) thorny evergreen small tree or shrub of India widely cultivated for its large lemonlike fruits that have thick warty rind | Synonyms: citron tree, Citrus medica |
| citronwood | (noun) wood of a citron tree | - |
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| (noun) durable fragrant wood; used in building (as in the roof of the cathedral at Cordova, Spain) | Synonyms: sandarac |
| cosmotron | (noun) a large proton synchrotron; uses frequency modulation of an electric field to accelerate protons | - |
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| cyclotron | (noun) an accelerator that imparts energies of several million electron-volts to rapidly moving particles | - |
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| electron | (noun) an elementary particle with negative charge | Synonyms: negatron |
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| electronegativity | (noun) (chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond | Synonyms: negativity |
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| electronics | (noun) the branch of physics that deals with the emission and effects of electrons and with the use of electronic devices | - |
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| elytron | (noun) either of the horny front wings in beetles and some other insects which cover and protect the functional hind wings | Synonyms: wing case |
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| estrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: Estronol, oestrone, theelin |
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| gastronome | (noun) a person devoted to refined sensuous enjoyment (especially good food and drink) | Synonyms: bon vivant, epicure, epicurean, foodie, gourmet |
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| gastronomy | (noun) the art and practice of choosing and preparing and eating good food | - |
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| (noun) a particular style of cookery (as of a region) | - |
| intron | (noun) sequence of a eukaryotic gene's DNA that is not translated into a protein | Synonyms: noncoding DNA |
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| kenotron | (noun) a type of vacuum tube formerly used as a high-voltage rectifier. | - |
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| klystron | (noun) an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation | - |
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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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| matron | (noun) a married woman (usually middle-aged with children) who is staid and dignified | - |
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| (noun) a woman in charge of nursing in a medical institution | - |
| (noun) a wardress in a prison | - |
| matronymic | (noun) a name derived from the name of your mother or a maternal ancestor | Synonyms: metronymic |
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| mesotron | (noun) an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | Synonyms: meson |
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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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| microelectronics | (noun) the branch of electronics that deals with miniature components | - |
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| minestrone | (noun) soup made with a variety of vegetables | Synonyms: petite marmite, vegetable soup |
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| negatron | (noun) an elementary particle with negative charge | Synonyms: electron |
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| neutron | (noun) an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus | - |
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| oestrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: estrone, Estronol, theelin |
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| patron | (noun) a regular customer | Synonyms: frequenter |
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| (noun) someone who supports or champions something | Synonyms: sponsor, supporter |
| (noun) the proprietor of an inn | - |
| patronage | (noun) the act of providing approval and support | Synonyms: backing, backup, championship |
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| (noun) (politics) granting favors or giving contracts or making appointments to office in return for political support | - |
| (noun) the business given to a commercial establishment by its customers | Synonyms: trade |
| (noun) a communication that indicates lack of respect by patronizing the recipient | Synonyms: condescension, disdain |
| (noun) customers collectively | Synonyms: business, clientele |
| patroness | (noun) a woman who is a patron or the wife of a patron | Synonyms: patronne |
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| patronne | (noun) a woman who is a patron or the wife of a patron | Synonyms: patroness |
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| patronym | (noun) a family name derived from name of your father or a paternal ancestor (especially with an affix (such as -son in English or O'- in Irish) added to the name of your father or a paternal ancestor) | Synonyms: patronymic |
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| patronymic | (noun) a family name derived from name of your father or a paternal ancestor (especially with an affix (such as -son in English or O'- in Irish) added to the name of your father or a paternal ancestor) | Synonyms: patronym |
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| photoelectron | (noun) an electron that is emitted from an atom or molecule by an incident photon | - |
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| plastron | (noun) (zoology) the part of a turtle's shell forming its underside | - |
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| (noun) a large pad worn by a fencer to protect the chest | - |
| (noun) a metal breastplate that was worn under a coat of mail | - |
| (noun) the front of man's dress shirt | - |
| (noun) the ornamental front of a woman's bodice or shirt | - |
| plectron | (noun) a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument | Synonyms: pick, plectrum |
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| positron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: antielectron |
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| quercitron | (noun) medium to large deciduous timber tree of the eastern United States and southeastern Canada having dark outer bark and yellow inner bark used for tanning; broad five-lobed leaves are bristle-tipped | Synonyms: black oak, quercitron oak, Quercus velutina, yellow oak |
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| (noun) a yellow dye made from the bark of the quercitron oak tree | - |
| retronym | (noun) a word introduced because an existing term has become inadequate | - |
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| stabilitron | (noun) a semiconductor diode that exhibits a sharp increase in reverse current at a well-defined reverse voltage: used as a voltage regulator | Synonyms: zenerdiode |
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| strongbox | (noun) a strongly made box for holding money or valuables; can be locked | Synonyms: deedbox |
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| stronghold | (noun) a strongly fortified defensive structure | Synonyms: fastness |
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| strongman | (noun) a powerful political figure who rules by the exercise of force or violence | - |
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| (noun) a man who performs feats of strength at a fair or circus | - |
| strongroom | (noun) a burglarproof and fireproof room in which valuables are kept | - |
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| strontianite | (noun) a mineral consisting of strontium carbonate | - |
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| strontium | (noun) a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite | Synonyms: atomic number 38, Sr |
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| synchrocyclotron | (noun) cyclotron that achieves relativistic velocities by modulating the frequency of the accelerating electric field | - |
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| synchrotron | (noun) cyclotron in which the electric field is maintained at a constant frequency | - |
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