| ANTIHYDROGENS | • antihydrogens n. Plural of antihydrogen. • ANTIHYDROGEN n. an antimatter form of hydrogen.
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| CHIMNEYBOARDS | • CHIMNEYBOARD n. a board blocking up a fireplace. | 
| CYBERCHONDRIA | • cyberchondria n. Anxiety concerning one’s health, caused by visiting medical websites. • CYBERCHONDRIA n. unfounded anxiety concerning the state of one's health brought on by visiting health and medical websites.
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| DEHYDROGENISE | • dehydrogenise v. Alternative spelling of dehydrogenize. • DEHYDROGENISE v. to remove hydrogen from, also DEHYDROGENIZE.
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| DEHYDROGENIZE | • dehydrogenize v. To dehydrogenate. • DEHYDROGENIZE v. to remove the hydrogen from, also DEHYDROGENISE.
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| DRYOPITHECINE | • dryopithecine adj. (Zoology) Of, or relating to, the primate genus Dryopithecus, considered to be relatives of both humans and apes. • dryopithecine n. (Zoology) Any member of this genus of primates.
 • DRYOPITHECINE n. a gorilla, chimpanzee or man.
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| DYSMENORRHEIC | • dysmenorrheic adj. Of, pertaining to, or experiencing dysmenorrhea. • DYSMENORRHEIC adj. relating to dysmenorrhea, also DYSMENORRHOEIC.
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| HYALURONIDASE | • hyaluronidase n. (Biochemistry) Any enzyme that catalyses the hydrolysis of hyaluronic acid. • HYALURONIDASE n. a mucolytic enzyme that facilitates the spread of fluids through tissues by lowering the viscosity of hyaluronic acid.
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| HYDROGENATING | • hydrogenating v. Present participle of hydrogenate. • HYDROGENATE v. to combine or treat with hydrogen.
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| HYDROGENATION | • hydrogenation n. (Chemistry) The chemical reaction of hydrogen with another substance, especially with an unsaturated… • HYDROGENATION n. the act of hydrogenating.
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| HYDROGENISING | • hydrogenising v. Present participle of hydrogenise. • HYDROGENISE v. to hydrogenate, also HYDROGENIZE.
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| HYDROGENIZING | • hydrogenizing v. Present participle of hydrogenize. • HYDROGENIZE v. to hydrogenate, also HYDROGENISE.
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| HYDROKINETICS | • hydrokinetics n. (Physics) The branch of physics concerned with the movement of fluids. • HYDROKINETICS n. the study of the motion of fluids.
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| HYDROMAGNETIC | • hydromagnetic adj. Of or pertaining to hydromagnetics. • HYDROMAGNETIC adj. relating to hydromagnetics, a branch of mathematical physics dealing with interactions between an electricity-conducting fluid (such as an ionized gas) and a magnetic field.
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| HYDROQUINONES | • hydroquinones n. Plural of hydroquinone. • HYDROQUINONE n. another name for quinol.
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| HYDROXYLAMINE | • hydroxylamine n. (Inorganic chemistry) An explosive inorganic derivative of ammonia, NH2OH, used as a reducing agent… • hydroxylamine n. (Organic chemistry) Any organic derivative of this compound.
 • HYDROXYLAMINE n. a colorless odorless nitrogenous base that resembles ammonia in its reactions.
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| HYDROZINCITES | • hydrozincites n. Plural of hydrozincite. • HYDROZINCITE n. a monoclinic basic carbonate of zinc that is a secondary mineral occurring as light-coloured crusts on zinc deposits.
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| NONHEREDITARY | • nonhereditary adj. Not hereditary; not passed down by inheritance. • non-hereditary adj. Alternative form of nonhereditary.
 • NONHEREDITARY adj. not hereditary.
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| PYRITOHEDRONS | • pyritohedrons n. Plural of pyritohedron. • PYRITOHEDRON n. a pentagonal dodecahedron.
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| THERMODYNAMIC | • thermodynamic adj. Of, or relating to the conversion of heat into other forms of energy. • thermodynamic adj. (Physics) Of, or relating to thermodynamics.
 • THERMODYNAMIC adj. of or relating to thermodynamics, also THERMODYNAMICAL.
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