You searched for: “agglutinating
agglutinate (verb), agglutinates; agglutinated; agglutinating
To cause to adhere or to stick to; to unite: Barbara wanted the glue to agglutinate the two pieces of broken vase together.

Natasha wanted to know if she was Rh positive, so the doctor told her that it would be so if the antiserum agglutinated in her red blood cells.

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