| OXYMORONS | • oxymorons n. Plural of oxymoron. • OXYMORON n. (Greek) a self-contradictory expression.
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| OXYGENATORS | • oxygenators n. Plural of oxygenator. • OXYGENATOR n. an oxidizer.
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| PAROXYTONES | • paroxytones n. Plural of paroxytone. • PAROXYTONE n. a word having an acute accent on the penultimate syllable.
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| PYROXENOIDS | • pyroxenoids n. Plural of pyroxenoid. • PYROXENOID n. a mineral like pyroxene, a common mineral occurring in monoclinic crystals.
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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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| MORPHOSYNTAX | • morphosyntax n. (Linguistics) Morphology and syntax regarded as an interlinked unit. • morpho-syntax n. (Linguistics) The system of the internal structure of words (morphology) and the way in which words…
 • morpho-syntax n. (Linguistics, formal) Grammar.
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| OROPHARYNXES | • oropharynxes n. Plural of oropharynx. • OROPHARYNX n. the part of the pharynx between the soft palate and the epiglottis.
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| OXYHYDROGENS | • OXYHYDROGEN n. a mixture of hydrogen and oxygen used to provide an intense flame for welding. | 
| SEROTAXONOMY | • SEROTAXONOMY n. serological analysis as a source of information for taxonomic classification. | 
| DEOXYCORTONES | • DEOXYCORTONE n. a corticosteroid hormone important in maintaining sodium and water balance in the body. | 
| PROPOXYPHENES | • propoxyphenes n. Plural of propoxyphene. • PROPOXYPHENE n. a narcotic analgesic structurally related to methadone but less addicting.
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| CARBOXYLATIONS | • carboxylations n. Plural of carboxylation. • CARBOXYLATION n. the act of carboxylating.
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| CLINOPYROXENES | • clinopyroxenes n. Plural of clinopyroxene. • CLINOPYROXENE n. a member of the pyroxene group of minerals having a monoclinic crystal structure, such as augite, diopside, or jadeite.
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| HYDROXYLATIONS | • hydroxylations n. Plural of hydroxylation. • HYDROXYLATION n. the act of hydroxylating.
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| MORPHOSYNTAXES | • morphosyntaxes n. Plural of morphosyntax. • MORPHOSYNTAX n. the study of the interaction of morphology and syntax.
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| ORTHOPYROXENES | • orthopyroxenes n. Plural of orthopyroxene. • ORTHOPYROXENE n. a member of the pyroxene group of minerals having an orthorhombic crystal structure, such as enstatite and hypersthene.
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| PROPAROXYTONES | • proparoxytones n. Plural of proparoxytone. • PROPAROXYTONE n. in ancient Greek, a word having the acute accent on the third last syllable.
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| REOXYGENATIONS | • reoxygenations n. Plural of reoxygenation. | 
| HEXYLRESORCINOL | • hexylresorcinol n. (Organic chemistry) A hexyl derivative of resorcinol that has anaesthetic, antiseptic and antihelmintic properties. • HEXYLRESORCINOL n. a crystalline phenol used as an antiseptic and anthelmintic.
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| HYDROXYPROLINES | • hydroxyprolines n. Plural of hydroxyproline. • HYDROXYPROLINE n. an amino acid.
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