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    molecule

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    molecule
    mol‧e‧cule /ˈmɒlɪkjuːl $ ˈmɑː-/ noun [countable]
     Date: 1700-1800
     Language: French
     Origin: molécule, from Latin moles 'mass'
    the smallest unit into which any substance can be divided without losing its own chemical nature, usually consisting of two or more atoms:
        The molecules of oxygen gas contain just two atoms.
    —molecular /məˈlekjələ, məˈlekjʊlə $ -ər/ adjective:
        molecular structure