| exophthalmos | (noun) protrusion of the eyeball from the socket | - |
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| lagophthalmos | (noun) abnormal condition in which an eye cannot close completely | - |
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| nanophthalmos | (noun) condition in which both eyes are abnormally small but otherwise normal | - |
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| naphtha | (noun) any of various volatile flammable liquid hydrocarbon mixtures; used chiefly as solvents | - |
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| naphthalene | (noun) a white crystalline strong-smelling hydrocarbon made from coal tar or petroleum and used in organic synthesis and as a fumigant in mothballs | - |
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| nighthawk | (noun) mainly nocturnal North American goatsucker | Synonyms: bullbat, mosquito hawk |
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| (noun) a person who likes to be active late at night | Synonyms: night owl, nightbird |
| ophthalmectomy | (noun) surgical removal of an eye | - |
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| ophthalmia | (noun) severe conjunctivitis | Synonyms: ophthalmitis |
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| ophthalmitis | (noun) severe conjunctivitis | Synonyms: ophthalmia |
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| ophthalmologist | (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye | Synonyms: eye doctor, oculist |
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| ophthalmology | (noun) the branch of medicine concerned with the eye and its diseases | - |
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| ophthalmoplegia | (noun) paralysis of the motor nerves of the eye | - |
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| ophthalmoscope | (noun) medical instrument for examining the retina of the eye | - |
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| ophthalmoscopy | (noun) examination of the interior of an eye using an ophthalmoscope | - |
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| phenolphthalein | (noun) a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8 | - |
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| resorcinolphthalein | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluoresceine, fluorescent dye |
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| righthander | (noun) a person who uses the right hand more skillfully than the left | Synonyms: right-hander, right hander |
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| xerophthalmia | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xeroma, xerophthalmus |
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| xerophthalmus | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xeroma, xerophthalmia |
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