A substance or agent that causes colloid formation or promotes colloidal dispersion.
From colloid + -er (agent noun suffix). A technical term used in chemistry to describe substances that facilitate colloidal behavior, emerging in 20th-century scientific literature.
The term 'colloider' is so obscure that it barely appears in modern science—a perfect example of how technical jargon can become outdated as language and science evolve together.
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