A person or device that combines or blends different elements, materials, or groups into a unified whole.
From amalgamate plus the suffix -or (variant of -er, indicating 'one who does' or 'that which does'). The -or form is common in Latin-derived agent nouns in English.
The first 'amalgamators' in metalworking were actually simple mechanical devices—rotating drums lined with mercury that would blend metals together—and they were considered so revolutionary that their invention was literally patented and guarded as trade secrets in medieval Europe.
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