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.