| analeptic | (noun) a medication used as a stimulant to the central nervous system | - |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antiseptic | (noun) a substance that destroys micro-organisms that carry disease without harming body tissues | - |
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| cataleptic | (noun) a person suffering from catalepsy | - |
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| dyspeptic | (noun) a person suffering from indigestion | - |
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| ecliptic | (noun) the great circle representing the apparent annual path of the sun; the plane of the Earth's orbit around the sun; makes an angle of about 23 degrees with the equator | - |
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| ellipticity | (noun) the property possessed by a round shape that is flattened at the poles | Synonyms: oblateness |
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| epileptic | (noun) a person who has epilepsy | - |
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| fiberoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fibre optics, fibreoptics |
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| fibreoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fiberoptics, fibre optics |
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| glyptics | (noun) the art of engraving on precious stones | Synonyms: lithoglyptics |
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| lithoglyptics | (noun) the art of engraving on precious stones | Synonyms: glyptics |
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| narcoleptic | (noun) a soporific drug that produces an uncontrollable desire to sleep | - |
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| (noun) a person who has narcolepsy | - |
| neuroleptic | (noun) tranquilizer used to treat psychotic conditions when a calming effect is desired | Synonyms: antipsychotic, antipsychotic agent, antipsychotic drug, major tranquilizer, major tranquilliser, major tranquillizer, neuroleptic agent, neuroleptic drug |
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| optic | (noun) the organ of sight | Synonyms: eye, oculus |
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| optician | (noun) a worker who makes glasses for remedying defects of vision | Synonyms: lens maker |
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| optics | (noun) optical properties | - |
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| (noun) the branch of physics that studies the physical properties of light | - |
| orthoptics | (noun) treatment of defects of binocular vision (such as strabismus and amblyopia) by nonsurgical measures (especially by exercises to strengthen the eye muscles) | - |
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| panopticon | (noun) a circular prison with cells distributed around a central surveillance station; proposed by Jeremy Bentham in 1791 | - |
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| (noun) an area where everything is visible | - |
| sceptic | (noun) someone who habitually doubts accepted beliefs | Synonyms: doubter, skeptic |
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| scepticism | (noun) the disbelief in any claims of ultimate knowledge | Synonyms: agnosticism, skepticism |
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| (noun) doubt about the truth of something | Synonyms: disbelief, incredulity, mental rejection, skepticism |
| septicaemia | (noun) invasion of the bloodstream by virulent microorganisms from a focus of infection | Synonyms: blood poisoning, septicemia |
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| septicemia | (noun) invasion of the bloodstream by virulent microorganisms from a focus of infection | Synonyms: blood poisoning, septicaemia |
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| skeptic | (noun) someone who habitually doubts accepted beliefs | Synonyms: doubter, sceptic |
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| skepticism | (noun) doubt about the truth of something | Synonyms: disbelief, incredulity, mental rejection, scepticism |
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| (noun) the disbelief in any claims of ultimate knowledge | Synonyms: agnosticism, scepticism |
| styptic | (noun) a drug that causes contraction of body tissues and canals | Synonyms: astringent, astringent drug |
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| uptick | (noun) a transaction in the stock market at a price above the price of the preceding transaction | - |
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