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.
- 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.
- n. indicator provided by the stationary arm whose shadow indicates the time on the sundial
- 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)
“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.”
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