We don't have synonyms for girdling yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are piddling, middling and hireling.
(N) :
Girdling, also called ring-barking, is the circumferential removal or injury of the bark (consisting of cork cambium or "phellogen", phloem, cambium and sometimes also the xylem) of a branch or trunk of a woody plant.
(N) :
Girdling, also called ring-barking, is the circumferential removal or injury of the bark (consisting of cork cambium or "phellogen", phloem, cambium and sometimes also the xylem) of a branch or trunk of a woody plant.