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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