| HORRENDOUSLY | • horrendously adv. In a horrendous manner. • HORRENDOUS adv. fearful; frightful.
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| HYDROFLUORIC | • hydrofluoric adj. (Chemistry) Containing hydrogen and fluorine. • HYDROFLUORIC adj. as in hydrofluoric acid, a strong acid used for etching glass.
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| HYDROMEDUSAE | • hydromedusae n. Plural of hydromedusa. • HYDROMEDUSA n. a hydrozoan in its medusoid stage, also HYDROMEDUSAN, HYDROMEDUSOID.
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| HYDROMEDUSAN | • hydromedusan adj. (Zoology) Relating to the hydromedusas. • HYDROMEDUSAN n. a hydromedusa, also HYDROMEDUSA, HYDROMEDUSOID.
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| HYDROMEDUSAS | • hydromedusas n. Plural of hydromedusa. • HYDROMEDUSA n. a hydrozoan in its medusoid stage, also HYDROMEDUSAN, HYDROMEDUSOID.
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| HYDROPHANOUS | • hydrophanous adj. (Mineralogy) Made transparent by immersion in water. • HYDROPHANOUS adj. becoming transparent when placed in water.
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| HYDROPHILOUS | • hydrophilous adj. (Biology) That grows or thrives in or near water. • hydrophilous adj. (Botany) That is pollinated by water.
 • HYDROPHILOUS adj. water-loving; pollinated by agency of water.
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| HYDROPHOBOUS | • hydrophobous adj. Hydrophobic. • HYDROPHOBOUS adj. (obsolete) water-repellent.
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| HYDROPHYTOUS | • hydrophytous adj. Relating to hydrophytes. • hydrophytous adj. Relating to hydrophytons.
 • HYDROPHYTOUS adj. like a hydrophyte, also HYDROPHYTIC.
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| HYDROQUINOLS | • HYDROQUINOL n. a white crystalline soluble phenol used as a photographic developer. | 
| HYDROQUINONE | • hydroquinone n. (Organic chemistry) The diphenol para-dihydroxy benzene, used as a mild reducing agent in photographic… • HYDROQUINONE n. another name for quinol.
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| HYDROXONIUMS | • hydroxoniums n. Plural of hydroxonium. • HYDROXONIUM n. the obsolete name for the cation H3O+ derived from protonation of water.
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| HYDROXYUREAS | • hydroxyureas n. Plural of hydroxyurea. • HYDROXYUREA n. a drug used to treat some forms of leukemia, melanoma, and malignant tumors.
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| PACHYDERMOUS | • PACHYDERMOUS adj. thick-skinned, also PACHYDERMATOUS. | 
| PSEUDOGRAPHY | • pseudography n. False writing; forgery. • pseudography n. Incorrect spelling.
 • PSEUDOGRAPHY n. unsatisfactory spelling.
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| THUNDEROUSLY | • thunderously adv. In a thunderous manner, very loudly. • THUNDEROUS adv. sounding like thunder, also THUNDROUS.
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| UNHYDROLYSED | • unhydrolysed adj. Alternative spelling of unhydrolyzed. • UNHYDROLYSED adj. not hydrolysed, also UNHYDROLYZED.
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| UNHYDROLYZED | • unhydrolyzed adj. Not hydrolyzed. • UNHYDROLYZED adj. not hydrolyzed, also UNHYDROLYSED.
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| UNORTHODOXLY | • unorthodoxly adv. In an unorthodox manner, unconventionally. • UNORTHODOX adv. not orthodox.
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| UNROADWORTHY | • unroadworthy adj. Describing a vehicle which is not safe for use on the road. • UNROADWORTHY adj. not roadworthy.
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