GC: n

S: SDir – https://www.sciencedirect.com/topics/medicine-and-dentistry/trephine (last access: 20 September 2024); NCBI – https://pubmed.ncbi.nlm.nih.gov/38093161/ (last access: 20 September 2024).

N: 1. An improved kind of trepan, 1620s, from French trephine, which is said to be from Latin tres fines “three ends,” but perhaps rather an arbitrary diminutive of “trepan”. As a verb from 1804. Related: Trephining; trephination.

2. A surgical instrument for cutting out circular sections (as of bone or corneal tissue).

3. Surgical instrument: trephine.

• A saw for removing a disk of bone, chiefly from the skull.

4. Surgical instrument: cranial drill, trepan, trephine.

• A surgical tool used to cut out circular pieces of bone or other tissue.
• According to some sources, trepan and trephine are synonyms. But according to others, there is a difference between the trepan (drill) and the trephine, the trephine being an improvement on the trepan and consisting of a circular or cylindrical saw, with a handle like that of a gimlet, and a little sharp perforator called the center pin.

5. Dentistry: trephine.

• A primarily end-cutting hollow cylindrical or truncated conical head.

S: 1. Etymonline – https://www.etymonline.com/search?q=trephine (last access: 20 September 2024). 2. MW – https://www.merriam-webster.com/dictionary/trephine (last access: 20 September 2024). 3 to 5. TERMIUM PLUS – https://www.btb.termiumplus.gc.ca/tpv2alpha/alpha-eng.html?lang=eng&i=1&srchtxt=trephine&index=alt&codom2nd_wet=1#resultrecs (last access: 20 September 2024).

SYN:
S:

CR: trephination