Agglutinate is a verb that means to firmly stick together to form a mass. 

The Latin word gluten (GLUE ten) meaning ‘to adhere’ has given birth to the word ‘glue’ as well as our word of the day. Agglutinate has stuck around since the mid-16th century. It’s often sued in a medical context. Here’s an example:

In medical school, we learned how red blood cells often agglutinate and form intricate meshes. We later learned how important it is for these cells to stick together.