Capable of being combined, blended, or merged together with other elements into a single unified substance or whole.
From amalgamate plus the suffix -able (meaning 'capable of'). The root amalgam comes from Medieval Latin and possibly Arabic sources related to softening or blending.
Some materials are more 'amalgamable' than others—mercury is so good at mixing with metals that it became the standard for creating dental and mirror amalgams, which is why old mirrors are actually coated with a mercury-tin mixture that made them so reflective.
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