The Collaborative International Dictionary of English v.0.48:

Vulcan \Vul"can\, n. [L. Vulcanus, Volcanus: cf. Skr. ulk[=a] a
   firebrand, meteor. Cf. Volcano.] (Rom. Myth.)
   The god of fire, who presided over the working of metals; --
   answering to the Greek Hephaestus.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Vulcan
    n 1: (Roman mythology) god of fire and metal working;
         counterpart of Greek Hephaestus

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "Vulcan":
   Agdistis, Amor, Aphrodite, Apollo, Apollon, Ares, Artemis, Ate,
   Athena, Bacchus, Ceres, Cora, Cronus, Cupid, Cybele, Demeter,
   Despoina, Diana, Dionysus, Dis, Eros, Gaea, Gaia, Ge, Great Mother,
   Hades, Helios, Hephaestus, Hera, Here, Hermes, Hestia, Hymen,
   Hyperion, Jove, Juno, Jupiter, Jupiter Fidius, Jupiter Fulgur,
   Jupiter Optimus Maximus, Jupiter Pluvius, Jupiter Tonans, Kore,
   Kronos, Magna Mater, Mars, Mercury, Minerva, Mithras, Momus,
   Neptune, Nike, Olympians, Olympic gods, Ops, Orcus, Persephassa,
   Persephone, Phoebus, Phoebus Apollo, Pluto, Poseidon, Proserpina,
   Proserpine, Rhea, Saturn, Tellus, Venus, Vesta, Wayland, Zeus,
   farrier, forger, metalworker, smith



The Free On-line Dictionary of Computing (30 December 2018):

VULCAN

   1.  A version of JPLDIS ported to CP/M by Wayne
   Ratliff around 1980.  VULCAN evolved into dBASE II.

   2.  The dBASE-like interpreter and compiler
   sold by RSPI with their Emerald Bay product.  [Same as 1?]

   3.  An early string manipulation language.

   ["VULCAN - A String Handling Language with Dynamic Storage
   Control", E.P. Storm et al, Proc FJCC 37, AFIPS, Fall 1970].

   4.  A concurrent object-oriented logic
   programming language implemented as a preprocessor for
   FCP by Kahn et al at Xerox PARC.

   ["Vulcan: Logical Concurrent Objects", K. Kahn et al in
   Research Directions in Object- Oriented Programming,
   A.B. Shriver et al eds, MIT Press 1987].

   (2004-09-01)