A substance resembling agglutinin in structure or function but not identical; an agglutinin-like molecule.
From agglutinin + -oid (Greek -oeides 'resembling'). The -oid suffix indicates similarity without identity, like android 'human-like' but not actually human.
Agglutinoids discovered in some plant proteins show that nature invented sticky clumping mechanisms long before evolution created immune systems—it's an elegant recycling of chemistry across different domains of life.
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