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(heading) Chemical elements or alloys, and the mines where their ores come from.
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(heraldry) A light tincture used in a coat of arms, specifically argent (white or silver) and or (gold).
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(glassblowing) Molten glass that is to be blown or moulded to form objects.
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(music) A category of rock music encompassing a number of genres (including thrash metal, death metal, heavy metal, etc.) characterized by strong drum-beats and distorted guitars.
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(figurative, archaic) The substance that constitutes something or someone; matter; hence, character or temper.
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The effective power or calibre of guns carried by a vessel of war.
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(UK, in the plural) The rails of a railway.
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(informal, travel, aviation) The actual airline operating a flight, rather than any of the codeshare operators.