A person or thing that assimilates, or takes in and makes part of itself.
From Latin 'assimilatus' plus the agent suffix '-or' (one who does). This suffix directly replaced the older English '-er,' showing Latin influence in professional and technical terminology.
Native English would use '-er' (like 'learner'), but we use '-or' for assimilator because it sounds more technical and scientific—our brains associate Latin-derived words with authority and expertise.
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