| catholicon | (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: cure-all, nostrum, panacea |
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| emoticon | (noun) a representation of a facial expression (as a smile or frown) created by typing a sequence of characters in sending email | - |
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| helicon | (noun) a tuba that coils over the shoulder of the musician | Synonyms: bombardon |
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| icon | (noun) a visual representation (of an object or scene or person or abstraction) produced on a surface | Synonyms: ikon, image, picture |
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| (noun) a conventional religious painting in oil on a small wooden panel; venerated in the Eastern Church | Synonyms: ikon |
| (noun) (computer science) a graphic symbol (usually a simple picture) that denotes a program or a command or a data file or a concept in a graphical user interface | - |
| lexicon | (noun) a language user's knowledge of words | Synonyms: mental lexicon, vocabulary |
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| (noun) a reference book containing an alphabetical list of words with information about them | Synonyms: dictionary |
| onomasticon | (noun) a list of proper nouns naming persons or places | - |
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| orthicon | (noun) a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons | Synonyms: image orthicon |
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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 | - |
| pantechnicon | (noun) a large moving van (especially one used for moving furniture) | - |
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| silicon | (noun) a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors | Synonyms: atomic number 14, Si |
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