invasive -
relating to a technique in which the body is entered by puncture or incision
medical specialty,
medicine the learned profession that is mastered by graduate training in a medical school and that is devoted to preventing or alleviating or curing diseases and injuries; "he studied medicine at Harvard"
invasive -
gradually intrusive without right or permission; "we moved back from the encroaching tide"; "invasive tourists"; "trespassing hunters"