| ACROGENS | • acrogens n. Plural of acrogen. • ACROGEN n. a cryptogam with a distinct permanent stem; a fern, a moss.
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| CRYOGENS | • cryogens n. Plural of cryogen. • CRYOGEN n. a substance for producing low temperatures.
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| ENDOGENS | • endogens n. Plural of endogen. • ENDOGEN n. a plant which grows from within.
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| HALOGENS | • halogens n. Plural of halogen. • HALOGEN n. any of the group of elements fluorine, chlorine, bromine, iodine, and astatine.
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| HUMOGENS | • HUMOGEN n. a fertilizer composed of peat treated with a culture of nitrogen-fixing bacteria. | 
| IONOGENS | • ionogens n. Plural of ionogen. • IONOGEN n. a compound capable of forming ions.
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| KEROGENS | • kerogens n. Plural of kerogen. • KEROGEN n. a kind of bitumen found in oil shale.
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| LYSOGENS | • lysogens n. Plural of lysogen. • LYSOGEN n. an antigen increasing lysin production.
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| MITOGENS | • mitogens n. Plural of mitogen. • MITOGEN n. a substance that causes cells to divide.
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| ONCOGENS | • oncogens n. Plural of oncogen. • ONCOGEN n. an agent producing cancerous tumours, also ONCOGENE.
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| PYROGENS | • pyrogens n. Plural of pyrogen. • PYROGEN n. a substance that produces fever.
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| TELOGENS | • telogens n. Plural of telogen. • TELOGEN n. the phase in the hair growth cycle during which a new hair is formed in the follicle and a hair that has stopped growing is shed.
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| XYLOGENS | • XYLOGEN n. (Greek) a woody tissue in trees or plants, also XYLEM. | 
| ZYMOGENS | • zymogens n. Plural of zymogen. • ZYMOGEN n. a substance that develops into an enzyme, also ZYMOGENE.
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