trepan ( synonym found)
Definition of trepan:

(n) : a tool used to bore through rock when sinking shafts; a surgical instrument used to remove a circular section of bone from the skull; a trephine
(v) : to create a large hole by making a narrow groove outlining the shape of the hole and then removing the plug of material remaining by less expensive means; to use a trepan; to trephine
Definition of trepan:

(n) : a tool used to bore through rock when sinking shafts; a surgical instrument used to remove a circular section of bone from the skull; a trephine
(v) : to create a large hole by making a narrow groove outlining the shape of the hole and then removing the plug of material remaining by less expensive means; to use a trepan; to trephine
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