from The American Heritage® Dictionary of the English Language, 4th 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The pointer on a sundial.
- n. A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.
from the GNU version of the Collaborative International Dictionary of English
- n. 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. 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. 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.
from The 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.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. indicator provided by the stationary arm whose shadow indicates the time on the sundial
Latin gnōmōn, from Greek, interpreter, pointer of a sundial, from gignōskein, to know.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin gnomon, from Ancient Greek γνώμων (gnōmōn, "indicator"), related to γιγνώσκω (gignōskō, "I know") and γνῶσις (gnōsis, "knowledge"). (Wiktionary)