gnomon

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gnomon indicator, esp. of a sundial; †nose; part of a parallelogram remaining after a similar one is taken from one corner (from the resemblance to a carpenter's square ⌈). XVI. — F. gnomon or L. gnōmōn — Gr. gnṓmōn inspector, indicator, carpenter's square, f. IE. *gnō-; see KNOW.

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gnomon A device that is erected beside a rock or structure of interest to provide a reference for the vertical and colour. It was used during the manned exploration of the Moon.

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