| HEXADACTYLIC | • hexadactylic adj. Hexadactylous. • HEXADACTYLIC adj. having six fingers, also HEXADACTYLOUS.
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| HEXAHYDRATED | • hexahydrated adj. Converted to a hexahydrate. • HEXAHYDRATED adj. like a hexahydrate, a chemical compound with six molecules of water.
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| HEXAHYDRATES | • hexahydrates n. Plural of hexahydrate. • HEXAHYDRATE n. a chemical compound with six molecules of water.
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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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| HYDROXYLASES | • hydroxylases n. Plural of hydroxylase. • HYDROXYLASE n. any of a group of enzymes that catalyze oxidation reactions.
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| HYDROXYLATED | • hydroxylated v. Simple past tense and past participle of hydroxylate. • hydroxylated adj. (Organic chemistry) That has been modified by hydroxylation.
 • HYDROXYLATE v. to introduce hydroxyl into.
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| HYDROXYLATES | • hydroxylates v. Third-person singular simple present indicative form of hydroxylate. • HYDROXYLATE v. to introduce hydroxyl into.
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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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| HYDROXYZINES | • hydroxyzines n. Plural of hydroxyzine. • HYDROXYZINE n. a compound used as an antihistamine and tranquilizer.
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| HYPEREXCITED | • hyperexcited adj. Very highly excited. • HYPEREXCITED adj. excessively excited.
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| HYPEREXTENDS | • hyperextends v. Third-person singular simple present indicative form of hyperextend. • HYPEREXTEND v. to extend so that the angle between bones of a joint is greater than normal.
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| NEOORTHODOXY | • Neoorthodoxy n. Alternative form of Neo-orthodoxy. • neo-orthodoxy n. (Christianity, theology) A theological movement developed in the aftermath of World War I, largely a…
 • Neo-orthodoxy n. Alternative letter-case form of neo-orthodoxy.
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| OXYHYDROGENS | • OXYHYDROGEN n. a mixture of hydrogen and oxygen used to provide an intense flame for welding. | 
| OXYSULPHIDES | • oxysulphides n. Plural of oxysulphide. • OXYSULPHIDE n. a compound containing an element combined with oxygen and sulphur.
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| UNORTHODOXLY | • unorthodoxly adv. In an unorthodox manner, unconventionally. • UNORTHODOX adv. not orthodox.
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