The Collaborative International Dictionary of English v.0.48:

Metal \Met"al\ (? or ?; 277), n. [F. m['e]tal, L. metallum
   metal, mine, Gr. ? mine; cf. Gr. ? to search after. Cf.
   Mettle, Medal.]
   1. (Chem.) An elementary substance, as sodium, calcium, or
      copper, whose oxide or hydroxide has basic rather than
      acid properties, as contrasted with the nonmetals, or
      metalloids. No sharp line can be drawn between the metals
      and nonmetals, and certain elements partake of both acid
      and basic qualities, as chromium, manganese, bismuth, etc.
      [1913 Webster]

   Note: Popularly, the name is applied to certain hard, fusible
         metals, as gold, silver, copper, iron, tin, lead, zinc,
         nickel, etc., and also to the mixed metals, or metallic
         alloys, as brass, bronze, steel, bell metal, etc.
         [1913 Webster]

   2. Ore from which a metal is derived; -- so called by miners.
      --Raymond.
      [1913 Webster]

   3. A mine from which ores are taken. [Obs.]
      [1913 Webster]

            Slaves . . . and persons condemned to metals. --Jer.
                                                  Taylor.
      [1913 Webster]

   4. The substance of which anything is made; material; hence,
      constitutional disposition; character; temper.
      [1913 Webster]

            Not till God make men of some other metal than
            earth.                                --Shak.
      [1913 Webster]

   5. Courage; spirit; mettle. See Mettle. --Shak.
      [1913 Webster]

   Note: The allusion is to the temper of the metal of a sword
         blade. --Skeat.
         [1913 Webster]

   6. The broken stone used in macadamizing roads and ballasting
      railroads.
      [1913 Webster]

   7. The effective power or caliber of guns carried by a vessel
      of war.
      [1913 Webster]

   8. Glass in a state of fusion. --Knight.
      [1913 Webster]

   9. pl. The rails of a railroad. [Eng.]
      [1913 Webster]

   Base metal (Chem.), any one of the metals, as iron, lead,
      etc., which are readily tarnished or oxidized, in contrast
      with the noble metals. In general, a metal of small value,
      as compared with gold or silver.

   Fusible metal (Metal.), a very fusible alloy, usually
      consisting of bismuth with lead, tin, or cadmium.

   Heavy metals (Chem.), the metallic elements not included in
      the groups of the alkalies, alkaline earths, or the
      earths; specifically, the heavy metals, as gold, mercury,
      platinum, lead, silver, etc.

   Light metals (Chem.), the metallic elements of the alkali
      and alkaline earth groups, as sodium, lithium, calcium,
      magnesium, etc.; also, sometimes, the metals of the
      earths, as aluminium.

   Muntz metal, an alloy for sheathing and other purposes,
      consisting of about sixty per cent of copper, and forty of
      zinc. Sometimes a little lead is added. It is named from
      the inventor.

   Prince's metal (Old Chem.), an alloy resembling brass,
      consisting of three parts of copper to one of zinc; --
      also called Prince Rupert's metal.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Metal \Met"al\, v. t. [imp. & p. p. Metaled (? or ?) or
   Metalled; p. pr. & vb. n. Metaling or Metalling.]
   To cover with metal; as, to metal a ship's bottom; to metal a
   road.
   [1913 Webster]

WordNet (r) 3.0 (2006):

metal
    adj 1: containing or made of or resembling or characteristic of
           a metal; "a metallic compound"; "metallic luster"; "the
           strange metallic note of the meadow lark, suggesting the
           clash of vibrant blades"- Ambrose Bierce [syn:
           metallic, metal(a)] [ant: nonmetal, nonmetallic]
    n 1: any of several chemical elements that are usually shiny
         solids that conduct heat or electricity and can be formed
         into sheets etc. [syn: metallic element, metal]
    2: a mixture containing two or more metallic elements or
       metallic and nonmetallic elements usually fused together or
       dissolving into each other when molten; "brass is an alloy of
       zinc and copper" [syn: alloy, metal]
    v 1: cover with metal

Moby Thesaurus II by Grady Ward, 1.0:

210 Moby Thesaurus words for "metal":
   Dutch foil, achievement, alerion, aluminum, aluminum foil,
   americium, animal charge, annulet, argent, armorial bearings,
   armory, arms, asphalt, azure, bandeau, bar, bar sinister, barium,
   baton, bearings, bend, bend sinister, beryllium, billet, bismuth,
   blacktop, blazon, blazonry, bordure, broad arrow, bullion,
   cadency mark, cadmium, calcium, canton, carpet, causeway, cement,
   cerium, cesium, chaplet, charge, chevron, chief, chrome, chromium,
   coat of arms, cobalt, cobblestone, cockatrice, concrete, copper,
   coronet, crescent, crest, cross, cross moline, crown, device,
   difference, differencing, dysprosium, eagle, earth metals, erbium,
   ermine, ermines, erminites, erminois, escutcheon, europium, falcon,
   fess, fess point, field, file, flag, flanch, fleur-de-lis, floor,
   fret, fur, fusil, gadolinium, gallium, garland, germanium, gold,
   gold dust, gold foil, gold leaf, griffin, gules, gyron, hatchment,
   helmet, heraldic device, holmium, honor point, impalement,
   impaling, indium, inescutcheon, iridium, iron, label, lanthanum,
   lead, lead foil, lion, lithium, lozenge, lutetium, magnesia,
   magnesium, manganese, mantling, marshaling, martlet, mascle,
   mercury, metal foil, metal leaf, metalleity, metallic, metallicity,
   metallics, metallike, metalline, metalloid, metalware, metalwork,
   molybdenum, motto, mullet, native metals, neodymium, nickel,
   niobium, noble metals, nombril point, octofoil, or, ordinary,
   organometallic, orle, osmium, pale, palladium, paly, pave, pean,
   pebble, pheon, phosphorus, platinum, polonium, potassium,
   praseodymium, precious metals, promethium, protactinium, purpure,
   quarter, quartering, radium, rare metals, rhenium, rose, rubidium,
   ruthenium, sable, saltire, samarium, scandium, scutcheon,
   semimetal, shield, silver, silver foil, sodium, spread eagle,
   strontium, subordinary, tantalum, tar, technetium, tenne, terbium,
   thallium, thulium, tin, tincture, tinfoil, titanium, torse,
   tressure, tungsten, unicorn, uranium, vair, vanadium, vert,
   wolfram, wreath, yale, ytterbium, yttrium, zinc, zirconium



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

METAL
       Machine Evaluation and Translation Language (Siemens)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

METAL
       Macro Expansion Template Attribute Language (TAL, ZPT, ZOPE)


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

METAL

   1. Mega-Extensive Telecommunications Applications Language.
   BBS language for PRODOS 8 on Apple II.

   2. The syntax-definition formalism of the Mentor system.
   Metal specifications are compiled to specifications for a
   scanner/parser generator such as Lex/Yacc.  "Metal: A
   Formalism to Specify Formalisms", G.  Kahn et al, Sci Comp
   Prog 3:151-188 (1983).