Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. An object, such as the style of a sundial, that projects a shadow used as an indicator.
- n. The geometric figure that remains after a parallelogram has been removed from a similar but larger parallelogram with which it shares a corner.
Century Dictionary and Cyclopedia
- n. On a sun-dial, the triangular projecting piece which by its shadow shows the hour of the day; also, any index to a sun-dial or to a meridian-mark, especially a very large one. The early gnomons used for astronomical purposes were vertical pillars or obelisks.
- n. The index of the hour-circle of a globe.
- n. A piece of a parallelogram left after a similar parallelogram has been removed from a corner of it. Thus, in the figure, EFGBCD is a gnomon.
- n. An odd number; one of the terms of an arithmetical series by which polygonal numbers are found. Also called gnomonic number.
Wiktionary
- n. The pointer on a sundial.
- n. geometry A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.
GNU Webster's 1913
- n. (Dialing) The style or pin, which by its shadow, shows the hour of the day. It is usually set parallel to the earth's axis.
- n. (Astron.) A style or column erected perpendicularly to the horizon, formerly used in astronomocal observations. Its principal use was to find the altitude of the sun by measuring the length of its shadow.
- n. (Geom.) The space included between the boundary lines of two similar parallelograms, the one within the other, with an angle in common. The parallelogram bf is the complement of the parallelogram df.
- n. The index of the hour circle of a globe.
WordNet 3.0
- n. indicator provided by the stationary arm whose shadow indicates the time on the sundial
Etymologies
- From Latin gnomon, from Ancient Greek γνώμων (gnōmōn, "indicator"), related to γιγνώσκω (gignōskō, "I know") and γνῶσις (gnōsis, "knowledge"). (Wiktionary)
- Latin gnōmōn, from Greek, interpreter, pointer of a sundial, from gignōskein, to know. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“Scholars have talked, indeed, of a Greek origin or of an Etruscan origin, and the technical term for the Roman surveying instrument, _groma_, has been explained as the Greek word 'gnomon', borrowed through an”
“Nelson informed everyone that the piece sticking up was called the gnomon.”
“This particular one is called a gnomon magic square, because clusters of any four contiguous numbers add up to the same sum.”
“It had always sounded strangely in my ears, like the word gnomon in the Euclid and the word simony in the”
“It had always sounded strangely in my ears, like the word gnomon in the Euclid and the word simony in the Catechism.”
“The gnomon is pierced with the letters I. C., and the arms of Mr. Conduitt, the owner, as granted to him in 1717, are engraved on the plate with his motto: "Cada uno es hijo de sus obras.”
“The gnomons of horizontal dials are often finely designed, but to meet with such work in a vertical gnomon is rare.”
“The gnomon is an iron rod pointing from the north pole.”
“The obscure name I revere the most is gnomon, which is the upright part of a sundial that casts the shadow.”
“On this device, the hour markers are on the cylinder and the gnomon is the horizontal brass arm.”
The Wall Street Journal: Artifacts from the Age of Astronomy
Lists
These user-created lists contain the word ‘gnomon’.
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G[r]eek
A collection of words found in English that are either purely Greek or have Greek etymology.
Please add with caution and certainty. Will be regularly updated by me.etymology, philosophy, laconic, disharmony, patriarchic, archaic, phlogiston, aether, aeon, angel, arachnid, rhythm and 346 more...
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Gene Wolfe
Please contribute your favorite words from any of Gene Wolfe’s books to this prize-winning list.
In case you come across words in this list which are too commonplace to fit in, please ...gallipot, roost, badelaire, oblesque, execration, dhole, amschaspand, arctother, chalcedony, penitence, asimi, autarch and 839 more...
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Interesting words
A list of words that are odd or words that I have looked up.
concupiscence, brize, scree, scoria, forestaff, spanaemia, valetudinarianism, distasture, pyrethrum, laudanum, gentian, bicameral and 11184 more...
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phrontistery - g
from phrontistery.info
gynaecology, gynaecomania, gyromancy, gyrograph, gyve, gyrus, gyron, gynaecocracy, gyrose, gynics, gutturotetany, gymnophobia and 439 more...
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Realia from Everywhere
Culturally defined terms and expressions from the four corners of the world
fjord, mistral steppe, tornado, tsunami, polder, kiwi, koala, sequoia, Abominable Snowman, paprika, spaghetti, empanada and 299 more...
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Logolepsy
"Luciferous Logolepsy is a collection of over 9,000 obscure English words. Though the definition of an 'English' word might seem to be straightforward, it is not. There exist so many adopted, deriv...
Anschauung, Areopagus, Argus, Briarean, Dei gratia, Dei judicium, Deo volente, Duecento, Foehn, Geflugelte Worte, Gegenschein, Hakenkreuz and 9230 more...
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Starts with a silent letter
...with grateful thanks to telofy (for "cnidarian"), and to the song "Crazy ABC's" by Barenaked Ladies.
cnidarian, mnemonic, chthonic, ptarmigan, psoriasis, psittacine, bdellium, aisle, czar, gnarly, gnat, gnaw and 82 more...
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logos's list
A poor pathetic thing, but mine own.
invidious, lugubriousness, vilify, noisome, synastry, front and center, declension, conjugation, regnal, diphthong, circumlocution, bishopric and 141 more...
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Words from Moby Dick
frigate, presumptuous, genteel, succor, hearthstone, gentry, factitious, bilious, insurgent, portent, enervate, genuflect and 303 more...
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hildjj's Words
bookmarklet, demisemiquaver, zeitgeist, hermeneutics, oligarch, quisling, absinthe, mellifluent, verisimilitude, implacable, necrotic, nacreous and 243 more...
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Unsorted
poliorcetikon, lethologica, aegrotat, haha, logolepsy, logomisia, anfractuosity, nudiustertian, tontine, herostrat, acroamatic, bibliotaph and 132 more...
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it's about time
nudiustertian, clock, tempus fugit, fugacious, gnomon, nychthemeron, yuga
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The Whiteness of the Whale
Words in Melville's "Moby Dick"
grapnels, spile, pea coffee, farrago, grego, bosky, bombazine, brevet, cenotaph, cupidity, kelson, obliquity and 164 more...
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bintalshamsa's list
My Favorite Words
weltschmerz, perspicacity, idée fixe, invigilator, salubrious, tchotchke, ex nihilo, invidious, malapropism, naïve, sardonic, elide and 1401 more...
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wreckingball's Words
reprehensible, problematize, crepuscular, deleterious, pestilent, strumpet, draggletail, interrobang, meretricious, systematize, schadenfreude, capricious and 443 more...
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spicolli's Words
terrapin, ravenous, fuck, sepulchral, garlic, suss, queer, curmudgeon, foodie, intricate, omphalos, subversion and 534 more...
Tweets
Looking for tweets for gnomon.

smeggo A time standstill. Oct 10, 2008
milosrdenstvi Also, the L-shaped thing left over when you remove a square from the corner of a square. Used extensively in Euclidean geometry. The g is pronounced. Aug 15, 2008