One of the mysteries of the English language finally explained.
(The name of) a former constellation, the Mural Quadrant, in what is now the northern part of the constellation of Bοötes.
Early 19th century; earliest use found in William Herschel (1738–1822), musician and astronomer. From post-classical Latin Quadrans Muralis Mural Quadrant (J. Bode Uranographia (figure); 1602 or earlier as the name of the instrument) from classical Latin quadrans + muralis.
Quadrans Muralis/ˌkwɒdranz ˌmjʊəˈreɪlɪs//ˌkwɒdranz ˌmjʊəˈrɑːlɪs/
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