Why is the ninth month called September?
1610s, from Latin resectionem (moninative resectio), noun of action from past participle stem of resecare "cut off, cut loose" (see resect). Surgical sense is from 1775.
resection re·sec·tion (rĭ-sěk'shən)n.
Surgical removal of part of an organ or a structure.
Removal of the articular ends of one or both bones forming a joint.