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Definition gnomon

Etymology

Borrowed from French gnomon, or directly from its etymon Latin gnomon, or directly from its etymon Ancient Greek ?????? (gn?m?n, “discerner, interpreter; carpenter’s square; gnomon of a sundial; (geometry) gnomon”), from ???????? (gign?sk?, “to be aware of; to perceive; to know”), ultimately from Proto-Indo-European *?neh?- (“to know”); the word is thus related to know.

The geometry sense (sense 4) is from the resemblance of the plane figure to a carpenter’s square. Similarly, a gnomon in mathematics (sense 4) is also shaped like a carpenter’s square when depicted pictorially if the figurate numbers are squares.

Noun

gnomon (plural gnomons)

1. An object such as a pillar or a rod that is used to tell time by the shadow it casts when the sun shines on it, especially the pointer on a sundial. [from mid 16th c.]
2. An object such as a pillar used by an observer to calculate the meridian altitude of the sun (that is, the altitude of the sun when it reaches the observer's meridian), for the purpose of determining the observer's latitude.
3. The index of the hour circle of a globe.
4. (geometry) A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.
5. (mathematics, by extension) A number representing the increment between two figurate numbers (“numbers equal to the numbers of dots in geometric figures formed of dots”).

Results 157 Words with the letters GNOMON

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