Hi Ashish,

'Desis ' is a suffix meaning surgical binding or surgical fixation, and it is used in the term 'arthrodesis'. Arthrodesis , also referred to as a joint fusion, the uniting of two bones at a joint, is typically completed through surgery.

In other words, you can define desis as fusion of two parts into one, stabilization .I hope my answer will help you.

All the very best!