| astrogator | (noun) the navigator of a spacecraft | - |
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| astroglia | (noun) tissue consisting of large stellate neuroglial cells | Synonyms: macroglia |
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| dextroglucose | (noun) an isomer of glucose that is found in honey and sweet fruits | Synonyms: dextrose, grape sugar |
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| electrograph | (noun) electrical device used for etching by electrolytic means | - |
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| (noun) an apparatus for the electrical transmission of pictures | - |
| estrogen | (noun) a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics | Synonyms: oestrogen |
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| gastrogavage | (noun) feeding a nutrient solution into the stomach through a tube through a surgically created opening | - |
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| goitrogen | (noun) any substance (such as thiouracil) that induces the formation of a goiter | - |
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| nitrogen | (noun) a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues | Synonyms: atomic number 7, N |
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| nitrogenase | (noun) an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia | - |
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| nitroglycerin | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerine, Nitrospan, Nitrostat, trinitroglycerin |
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| nitroglycerine | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerin, Nitrospan, Nitrostat, trinitroglycerin |
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| oestrogen | (noun) a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics | Synonyms: estrogen |
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| petroglyph | (noun) a carving or line drawing on rock (especially one made by prehistoric people) | - |
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| retrogaming | (noun) The hobby of playing or collecting older video games and computer games. | - |
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| 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 |
| spectrogram | (noun) a photographic record of a spectrum | Synonyms: spectrograph |
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| spectrograph | (noun) a spectroscope by which spectra can be photographed | - |
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| (noun) a photographic record of a spectrum | Synonyms: spectrogram |
| thermometrograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermograph |
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| trinitroglycerin | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerin, nitroglycerine, Nitrospan, Nitrostat |
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| troglodyte | (noun) someone who lives in a cave | Synonyms: cave dweller, cave man, caveman |
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| (noun) one who lives in solitude | Synonyms: hermit, recluse, solitary, solitudinarian |
| trogon | (noun) forest bird of warm regions of the New World having brilliant lustrous plumage and long tails | - |
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