| anastigmat | (noun) compound lens or lens system designed to be free of astigmatism and able to form approximately point images | - |
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| astigmatism | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmia |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmia |
| enigma | (noun) something that baffles understanding and cannot be explained | Synonyms: closed book, mystery, secret |
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| (noun) a difficult problem | Synonyms: brain-teaser, conundrum, riddle |
| enigmaticness | (noun) Mysteriousness, complexity; the property of being puzzling or inexplicable. | - |
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| (noun) The quality of a person of puzzling, secretive or contradictory character. | - |
| pigman | (noun) a herder or swine | Synonyms: swineherd |
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| rigmarole | (noun) a long and complicated and confusing procedure | Synonyms: rigamarole |
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| (noun) a set of confused and meaningless statements | Synonyms: rigamarole |
| sigma | (noun) the 18th letter of the Greek alphabet | - |
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| stigma | (noun) a skin lesion that is a diagnostic sign of some disease | - |
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| (noun) an external tracheal aperture in a terrestrial arthropod | - |
| (noun) a symbol of disgrace or infamy | Synonyms: brand, mark, stain |
| (noun) the apical end of the style where deposited pollen enters the pistil | - |
| stigmata | (noun) marks resembling the wounds on the crucified body of Christ | - |
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| stigmatic | (noun) a person whose body is marked by religious stigmata (such as marks resembling the wounds of the crucified Christ) | Synonyms: stigmatist |
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| stigmatisation | (noun) the act of stigmatizing | Synonyms: branding, stigmatization |
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| stigmatism | (noun) normal eyesight | - |
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| (noun) (optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point | - |
| (noun) the condition of having or being marked by stigmata | - |
| stigmatist | (noun) a person whose body is marked by religious stigmata (such as marks resembling the wounds of the crucified Christ) | Synonyms: stigmatic |
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| stigmatization | (noun) the act of stigmatizing | Synonyms: branding, stigmatisation |
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| wigmaker | (noun) someone who makes and sells wigs | - |
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