Etymology
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Vulcan (n.)
god of fire and metal-work in Roman mythology, 1510s, from Latin Vulcanus, Volcanus, according to Klein a word of Etruscan origin. Often with allusions to his lameness and the unfaithfulness of his wife, Venus. As the name of a hypothetical planet between Mercury and the Sun, it is attested from 1860 in English (see intramercurial). The Roman feast of Vulcanalia was on Aug. 23.
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May 

fifth month of the modern calendar, early 12c., Mai, from Old French mai and directly from Latin Majus, Maius mensis "month of May," possibly from Maja, Maia, a Roman earth goddess (wife of Vulcan) whose name is of unknown origin; possibly from PIE *mag-ya "she who is great," fem. suffixed form of root *meg- "great" (cognate with Latin magnus).

"[R]eckoned on the continent of Europe and in America as the last month of spring, but in Great Britain as the first of summer" [Century Dictionary, 1897]. Replaced Old English þrimilce, month in which cows can be milked three times a day. May marriages have been considered unlucky at least since Ovid's day. May-apple, perennial herb native to North America, so called for its time of blooming and its yellowish fruit, is attested from 1733, American English.

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