WYE
\wˈa͡ɪ], \wˈaɪ], \w_ˈaɪ]\
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The supports of a telescope, theodolite, or levelling instrument, so called from their resembling the letter Y. Written also Y.
By Daniel Lyons
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n. One of the two forked pieces or bearings resembling the letter Y in shape, in the opening or notch of which rest the ends of the axis supporting the telescope in a theodolite, the pivots in a transit instrument, and the like:-written also Y, pl. Y's.