A substance or compound related to coal and iron (martis being the Latin genitive of Mars, associated with iron).
From anthracis (Greek 'coal') + martis (Latin, relating to Mars/iron). This rare alchemical or metallurgical term blends coal terminology with iron references.
This bizarre word shows how old alchemists thought—they would reference Mars as the god of iron and talk about coal mixed with iron as if they were magical substances, which actually makes sense since coal-fired furnaces created the Iron Age.
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