Etymology
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agglutination (n.)

1540s, "act of uniting by glue," from Latin agglutinationem (nominative agglutinatio), noun of action from past-participle stem of agglutinare "fasten with glue, stick on," from ad "to" (see ad-) + glutinare "to glue," from gluten "glue," from PIE *glei- "clay," also forming words with a sense of "to stick together" (see clay). Use in philology is from mid-17c.

updated on August 11, 2018

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Definitions of agglutination from WordNet

agglutination (n.)
a clumping of bacteria or red cells when held together by antibodies (agglutinins);
agglutination (n.)
the building of words from component morphemes that retain their form and meaning in the process of combining;
agglutination (n.)
the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated;
Synonyms: agglutinating activity
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.