| CHALCEDONYX | • chalcedonyx n. (Mineralogy) An agate formed of a white opaque chalcedony alternating with a greyish translucent chalcedony. • CHALCEDONYX n. an agate of alternating white opaque and greyish transparent chalcedony.
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| DEHYDRATION | • dehydration n. The act or process of removing water from something. • dehydration n. The condition in which water in the body drops below normal levels, usually caused by illness, sweating…
 • DEHYDRATION n. loss or withdrawal of moisture.
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| DODECAPHONY | • dodecaphony n. (Music) 12-tone music, a form of composition using all 12 tones of the chromatic scale in such a way… • DODECAPHONY n. twelve-tone music, also DODECAPHONISM.
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| HANDYPERSON | • handyperson n. (Uncommon) A handyman or handywoman. • HANDYPERSON n. a person good at manual crafts.
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| HEDONICALLY | • hedonically adv. In a hedonic manner. • HEDONIC adv. pertaining to pleasure.
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| HEMODYNAMIC | • hemodynamic adj. (Medicine) Of or pertaining to hemodynamics, the circulation of blood in the body. • HEMODYNAMIC adj. relating to hemodynamics, also HAEMODYNAMIC.
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| HYDROGENASE | • hydrogenase n. (Biochemistry) Any enzyme that catalyzes the reduction of a substrate by the reversible oxidation of hydrogen. • HYDROGENASE n. an enzyme that catalyzes hydrogen formation in certain microorganisms.
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| HYDROGENATE | • hydrogenate v. (Chemistry, transitive) to treat something, or react something, with hydrogen; especially to react an… • HYDROGENATE v. to combine or treat with hydrogen.
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| HYDROMANCER | • hydromancer n. One who practices hydromancy. • HYDROMANCER n. one who practises hydromancy.
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| HYDROPHANES | • hydrophanes n. Plural of hydrophane. • HYDROPHANE n. a semitranslucent variety of opal that becomes translucent or transparent on immersion in water.
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| HYDROPLANED | • hydroplaned v. Simple past tense and past participle of hydroplane. • HYDROPLANE v. to travel by hydroplane, a light, flat-bottomed motorboat.
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| HYDROPLANES | • hydroplanes n. Plural of hydroplane. • HYDROPLANE v. to travel by hydroplane, a light, flat-bottomed motorboat.
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| HYPERDORIAN | • HYPERDORIAN adj. in Greek music, above the Dorian mode. | 
| HYPNOPAEDIA | • hypnopaedia n. Teaching (or learning) by subconscious means. • hypnopædia n. Rare spelling of hypnopaedia.
 • HYPNOPAEDIA n. training or instruction during sleep.
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| HYRACOIDEAN | • HYRACOIDEAN n. any member of a genus of mammals including the daman and the dassie or hyrax, also HYRACOID. | 
| MONOHYDRATE | • monohydrate n. (Chemistry) A hydrate whose solid contains a single molecule of water of crystallization per molecule… • MONOHYDRATE n. a hydrate containing one molecule of water per molecule of the compound.
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| OFFHANDEDLY | • offhandedly adv. In an offhand manner. • off-handedly adv. Alternative form of offhandedly.
 • OFFHANDED adv. ungraciously curt, also OFFHAND.
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| PHAENOTYPED | • PHAENOTYPE v. to categorise by phaenotype, the sum of the attributes of an individual, regarded as resulting from the interaction of its genotype with its environment, also PHENOTYPE. | 
| REHYDRATION | • rehydration n. The replenishment of water and electrolytes lost through dehydration. • REHYDRATION n. the act of rehydrating.
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