One of the mysteries of the English language finally explained.
(The name of) a former constellation of the southern hemisphere, the Royal Oak, created out of stars that were part of the former constellation Argo. Formerly also (in form Roboris Caroli) †used as a postpositive in the names of stars belonging to this constellation (obsolete).
Early 18th century; earliest use found in Robert Morden (d. 1703), maker of maps and globes. In some forms from post-classical Latin Robur Carolinum (E. Halley Catalogus stellarum australium; from classical Latin rōbur + post-classical Latin Carolinum, neuter of Carolinus of or relating to Charles from Carolus Charles + classical Latin -īnus, in allusion to the Royal Oak. In some forms from post-classical Latin Robur Caroli from classical Latin rōbur + post-classical Latin Caroli, genitive of Carolus Charles.
Robur Carolinum/ˌrəʊbə karəˈlʌɪnəm//ˌrəʊbə karəˈliːnəm/
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