| 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 |
| astigmia | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmatism |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmatism |
| depigmentation | (noun) absence or loss of pigmentation (or less than normal pigmentation) in the skin or hair | - |
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| 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. | - |
| figment | (noun) a contrived or fantastic idea | - |
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| hyperpigmentation | (noun) unusual darkening of the skin | - |
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| hypopigmentation | (noun) unusual lack of skin color | - |
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| neostigmine | (noun) a cholinergic drug (trade name Prostigmin) used to treat some ophthalmic conditions and to treat myasthenia gravis | Synonyms: Prostigmin |
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| paradigm | (noun) a standard or typical example | Synonyms: epitome, image, prototype |
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| (noun) the generally accepted perspective of a particular discipline at a given time | - |
| (noun) the class of all items that can be substituted into the same position (or slot) in a grammatical sentence (are in paradigmatic relation with one another) | Synonyms: substitution class |
| (noun) systematic arrangement of all the inflected forms of a word | - |
| photopigment | (noun) a special pigment found in the rods and cones of the retina | - |
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| physostigmine | (noun) used in treatment of Alzheimer's disease and glaucoma | - |
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| pigman | (noun) a herder or swine | Synonyms: swineherd |
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| pigment | (noun) a substance used as a coating to protect or decorate a surface (especially a mixture of pigment suspended in a liquid); dries to form a hard coating | Synonyms: paint |
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| (noun) dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.) | - |
| (noun) any substance whose presence in plant or animal tissues produces a characteristic color | - |
| pigmentation | (noun) coloration of living tissues by pigment | - |
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| (noun) the deposition of pigment in animals or plants or human beings | - |
| pigmy | (noun) an unusually small individual | Synonyms: pygmy |
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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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| sigmoidectomy | (noun) surgical removal of part or all of the sigmoid colon (usually to remove a malignant tumor) | - |
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| sigmoidoscope | (noun) an endoscope (a flexible fiberoptic probe) for examining the sigmoid colon | Synonyms: flexible sigmoidoscope |
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| sigmoidoscopy | (noun) visual examination (with a sigmoidoscope) of the lower third of the colon in a search for polyps | Synonyms: flexible sigmoidoscopy |
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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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