acrogen | (noun) any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem | - |
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agglutinogen | (noun) any substance that acts as an antigen to cause agglutinin production | - |
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allergen | (noun) any substance that can cause an allergy | - |
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androgen | (noun) male sex hormone that is produced in the testes and responsible for typical male sexual characteristics | Synonyms: androgenic hormone |
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antigen | (noun) any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies) | - |
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carcinogen | (noun) any substance that produces cancer | - |
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chromogen | (noun) a compound that can be converted to a pigment | - |
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collagen | (noun) a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling | - |
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comedogen | (noun) A substance that tends to produce acne, such as by clogging pores on the skin. | Synonyms: comedogenic, comedogenic substance |
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cryogen | (noun) a liquid that boils at below -160 C and is used as a refrigerant | - |
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crystallogen | (noun) any chemical element that belongs to the carbon group. | Synonyms: carbon group element, Group 14 element, tetragen, tetrel |
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cyanogen | (noun) a colorless toxic gas with a pungent almond odor; has been used in chemical warfare | - |
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endogen | (noun) a monocotyledonous flowering plant; the stem grows by deposits on its inside | Synonyms: liliopsid, monocot, monocotyledon |
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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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exogen | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, dicotyledon, magnoliopsid |
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fibrinogen | (noun) a protein present in blood plasma; converts to fibrin when blood clots | Synonyms: factor I |
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gen | (noun) informal term for information | - |
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glycogen | (noun) one form in which body fuel is stored; stored primarily in the liver and broken down into glucose when needed by the body | Synonyms: animal starch |
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goitrogen | (noun) any substance (such as thiouracil) that induces the formation of a goiter | - |
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hallucinogen | (noun) a psychoactive drug that induces hallucinations or altered sensory experiences | Synonyms: hallucinogenic drug, psychedelic drug, psychodelic drug |
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halogen | (noun) any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions | - |
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hydrogen | (noun) a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe | Synonyms: atomic number 1, H |
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immunogen | (noun) any substance or organism that provokes an immune response (produces immunity) when introduced into the body | Synonyms: immunizing agent |
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indigen | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, aborigine, indigene, native |
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isoagglutinogen | (noun) an antigen capable of causing the production of (or reacting with) an isoagglutinin | - |
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lactogen | (noun) any agent that enhances milk production | - |
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lungen | (noun) tree of southeastern Asia to Australia grown primarily for its sweet edible fruit resembling litchi nuts; sometimes placed in genera Euphorbia or Nephelium | Synonyms: Dimocarpus longan, Euphorbia litchi, longan, longanberry, Nephelium longana |
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methanogen | (noun) archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane; a source of natural gas | - |
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milliroentgen | (noun) a unit of exposure to ionizing radiation, one thousandth of a roentgen. | - |
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mitogen | (noun) an agent that triggers mitosis | - |
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morgen | (noun) a South African unit of measure equal to about 2 acres | - |
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mutagen | (noun) any agent (physical or environmental) that can induce a genetic mutation or can increase the rate of mutation | - |
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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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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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oxygen | (noun) a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust | Synonyms: atomic number 8, O |
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pangen | (noun) a hypothetical heredity-controlling particle of protoplasm. | - |
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pathogen | (noun) any disease-producing agent (especially a virus or bacterium or other microorganism) | - |
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pepsinogen | (noun) precursor of pepsin; stored in the stomach walls and converted to pepsin by hydrochloric acid in the stomach | - |
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plasminogen | (noun) an inactive form of plasmin that occurs in plasma and is converted to plasmin by organic solvents | - |
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progestogen | (noun) any of a group of steroid hormones that have the effect of progesterone | Synonyms: progestin |
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pyrogen | (noun) any substance that can cause a rise in body temperature | Synonyms: pyrectic |
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(noun) any substance characterized by its great flammability | - |
roentgen | (noun) a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air | Synonyms: R |
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smidgen | (noun) a tiny or scarcely detectable amount | Synonyms: iota, scintilla, shred, smidge, smidgeon, smidgin, tittle, whit |
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stercobilinogen | (noun) a chromogen formed in the intestine from the breakdown of bilirubin; yields urobilins on oxidation; some is excreted in the feces and some is resorbed and excreted in bile or urine | Synonyms: urobilinogen |
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teratogen | (noun) any agent that interferes with normal embryonic development: alcohol or thalidomide or X-rays or rubella are examples | - |
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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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trypsinogen | (noun) inactive precursor of trypsin; a substance secreted by the pancreas and converted to active trypsin by enterokinase in the small intestine | - |
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urobilinogen | (noun) a chromogen formed in the intestine from the breakdown of bilirubin; yields urobilins on oxidation; some is excreted in the feces and some is resorbed and excreted in bile or urine | Synonyms: stercobilinogen |
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zymogen | (noun) any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active | Synonyms: proenzyme |
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