| adiaphoron | (noun) (Stoic philosophy) a matter having no moral merit or demerit. | - |
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| (noun) a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures. | - |
| aileron | (noun) an airfoil that controls lateral motion | - |
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| andiron | (noun) metal supports for logs in a fireplace | Synonyms: dog-iron, dog, firedog |
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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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| apron | (noun) a garment of cloth or leather or plastic that is tied about the waist and worn to protect your clothing | - |
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| (noun) a paved surface where aircraft stand while not being used | - |
| (noun) the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain) | Synonyms: forestage, proscenium |
| (noun) (golf) the part of the fairway leading onto the green | - |
| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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| baron | (noun) a British peer of the lowest rank | - |
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| (noun) a very wealthy or powerful businessman | Synonyms: big businessman, business leader, king, magnate, mogul, power, top executive, tycoon |
| (noun) a nobleman (in various countries) of varying rank | - |
| 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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| boron | (noun) a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder | Synonyms: atomic number 5, B |
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| caldron | (noun) a very large pot that is used for boiling | Synonyms: cauldron |
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| cauldron | (noun) a very large pot that is used for boiling | Synonyms: caldron |
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| chaldron | (noun) a British imperial capacity measure (liquid or dry) equal to 36 bushels | - |
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| chamfron | (noun) medieval plate armor to protect a horse's head | Synonyms: chanfron, front-stall, frontstall, testiere |
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| chanfron | (noun) medieval plate armor to protect a horse's head | Synonyms: chamfron, front-stall, frontstall, testiere |
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| chaperon | (noun) one who accompanies and supervises a young woman or gatherings of young people | Synonyms: chaperone |
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| (verb) accompany as a chaperone | Synonyms: chaperone |
| chevron | (noun) an inverted V-shaped charge | - |
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| (noun) V-shaped sleeve badge indicating military rank and service | Synonyms: grade insignia, stripe, stripes |
| chylomicron | (noun) a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood | - |
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| cimarron | (noun) wild sheep of mountainous regions of western North America having massive curled horns | Synonyms: bighorn, bighorn sheep, Ovis canadensis, Rocky Mountain bighorn, Rocky Mountain sheep |
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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 |
| coelenteron | (noun) the saclike body cavity of a coelenterate | - |
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| 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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| decahedron | (noun) any polyhedron having ten plane faces | - |
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| deuteron | (noun) the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators | - |
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| dipteron | (noun) insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing | Synonyms: dipteran, dipterous insect, two-winged insects |
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| dodecahedron | (noun) any polyhedron having twelve plane faces | - |
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| electron | (noun) an elementary particle with negative charge | Synonyms: negatron |
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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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| enteron | (noun) the alimentary canal (especially of an embryo or a coelenterate) | - |
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| environ | (verb) extend on all sides of simultaneously; encircle | Synonyms: border, ring, skirt, surround |
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| ephemeron | (noun) anything short-lived, as an insect that lives only for a day in its winged form | Synonyms: ephemeral |
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| epidendron | (noun) any of various orchids of the genus Epidendrum | - |
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| flatiron | (noun) an iron that was heated by placing it on a stove | - |
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| gridiron | (noun) a cooking utensil of parallel metal bars; used to grill fish or meat | Synonyms: grid |
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| (noun) the playing field on which football is played | Synonyms: football field |
| hadron | (noun) any elementary particle that interacts strongly with other particles | - |
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| hemipteron | (noun) insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis | Synonyms: bug, hemipteran, hemipterous insect |
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| heron | (noun) grey or white wading bird with long neck and long legs and (usually) long bill | - |
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| hexahedron | (noun) any polyhedron having six plane faces | - |
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| hymenopteron | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopter, hymenopteran, hymenopterous insect |
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| hyperon | (noun) any baryon that is not a nucleon; unstable particle with mass greater than a neutron | - |
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| icosahedron | (noun) any polyhedron having twenty plane faces | - |
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| interferon | (noun) an antiviral protein produced by cells that have been invaded by a virus; inhibits replication of the virus | - |
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| intron | (noun) sequence of a eukaryotic gene's DNA that is not translated into a protein | Synonyms: noncoding DNA |
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| iron | (adjective) extremely robust | Synonyms: cast-iron |
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| (noun) home appliance consisting of a flat metal base that is heated and used to smooth cloth | Synonyms: smoothing iron |
| (noun) a golf club that has a relatively narrow metal head | - |
| (noun) implement used to brand live stock | Synonyms: branding iron |
| (noun) a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood | Synonyms: atomic number 26, Fe |
| (verb) press and smooth with a heated iron | Synonyms: iron out, press |
| 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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| lepidopteron | (noun) insect that in the adult state has four wings more or less covered with tiny scales | Synonyms: lepidopteran, lepidopterous insect |
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| linuron | (noun) a herbicide that kills weeds without harming vegetables | - |
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| macaron | (noun) a sweet meringue-based confection made with egg white, icing sugar, granulated sugar, almond powder or ground almond, and food colouring. | - |
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| macron | (noun) a diacritical mark (-) placed above a vowel to indicate a long sound | - |
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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 | - |
| mesophyron | (noun) a smooth prominence of the frontal bone between and above the eyebrows; the most forward projecting point of the forehead in the midline at the level of the supraorbital ridges | Synonyms: glabella |
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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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| micromicron | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: picometer, picometre |
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| micron | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micrometre |
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| midiron | (noun) long iron with a nearly vertical face | Synonyms: two iron |
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| millimicron | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, nanometer, nanometre, nm |
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| moneron | (noun) organisms that typically reproduce by asexual budding or fission and whose nutritional mode is absorption or photosynthesis or chemosynthesis | Synonyms: moneran |
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| moron | (noun) a person of subnormal intelligence | Synonyms: changeling, cretin, half-wit, idiot, imbecile, retard |
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| motoneuron | (noun) a neuron conducting impulses outwards from the brain or spinal cord | Synonyms: efferent neuron, motor nerve fiber, motor neuron |
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| negatron | (noun) an elementary particle with negative charge | Synonyms: electron |
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| nephron | (noun) any of the small tubules that are the excretory units of the vertebrate kidney | Synonyms: uriniferous tubule |
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| neuron | (noun) a cell that is specialized to conduct nerve impulses | Synonyms: nerve cell |
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| neuropteron | (noun) insect having biting mouthparts and four large membranous wings with netlike veins | Synonyms: neuropteran, neuropterous insect |
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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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| octahedron | (noun) any polyhedron having eight plane faces | - |
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| omicron | (noun) the 15th letter of the Greek alphabet | - |
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| operon | (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene | - |
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| orthopteron | (noun) any of various insects having leathery forewings and membranous hind wings and chewing mouthparts | Synonyms: orthopteran, orthopterous insect |
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| oxymoron | (noun) conjoining contradictory terms (as in `deafening silence') | - |
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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 | - |
| pentahedron | (noun) any polyhedron having five plane faces | - |
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| philodendron | (noun) often grown as a houseplant | - |
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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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| polyhedron | (noun) a solid figure bounded by plane polygons or faces | - |
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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 | - |
| rhododendron | (noun) any shrub of the genus Rhododendron: evergreen shrubs or small shrubby trees having leathery leaves and showy clusters of campanulate (bell-shaped) flowers | - |
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| rhombohedron | (noun) a parallelepiped bounded by six similar faces (either rhombuses or parallelograms) | - |
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| saffron | (noun) a shade of yellow tinged with orange | Synonyms: orange yellow |
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| (noun) dried pungent stigmas of the Old World saffron crocus | - |
| (noun) Old World crocus having purple or white flowers with aromatic pungent orange stigmas used in flavoring food | Synonyms: Crocus sativus, saffron crocus |
| squadron | (noun) an air force unit larger than a flight and smaller than a group | - |
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| (noun) a cavalry unit consisting of two or more troops and headquarters and supporting arms | - |
| (noun) a naval unit that is detached from the fleet for a particular task | - |
| 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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| 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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| tetrahedron | (noun) any polyhedron having four plane faces | - |
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| thysanopteron | (noun) an insect of the order Thysanoptera | Synonyms: thysanopter, thysanopterous insect |
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| thysanuron | (noun) primitive wingless insects: bristletail | Synonyms: thysanuran insect |
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| trapezohedron | (noun) a polyhedron whose faces are trapeziums | - |
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| trichopteron | (noun) caddis fly | Synonyms: trichopteran, trichopterous insect |
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