What does trepanned mean?
Trepanned is the past tense and past participle of the verb trepan. In its principal medical sense, it means that a hole has been made in the skull with a trepan, an instrument resembling a drill. Historically, this procedure was performed for many conditions, and the term remains associated with surgery and neurology. In a much less common figurative sense, to trepan someone means to deceive, trick, or outwit them, especially through cleverness. The word can also function as an adjective, as in “trepanned skull,” describing a skull that has undergone the operation. Although the medical sense is the best known, trepanned is distinctive because it preserves both a highly specific surgical meaning and an older figurative sense. It is especially useful when precise language is needed to distinguish an actual trepan opening from a more general boring procedure.
To make an opening in the skull with a trepan; figuratively, to deceive or outwit someone.
"The emergency team trepanned the patient's skull to reduce intracranial pressure."
The surgical sense is technical; the figurative sense is literary and uncommon.
Having undergone trepanation, or having had an opening made in the skull with a trepan.
"Researchers examined the trepanned skull for evidence of the ancient procedure."
This is chiefly a participial adjective, as in “trepanned skull” or “trepanned patient.”
From a frightening surgical procedure to a metaphor for being cleverly outwitted, trepanned has drilled its way into English.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does trepanned come from?
The word comes through French trépan from Medieval Latin trepanum, ultimately from Greek trépanon, meaning a borer or drill and related to the Greek verb trepein, “to turn” or “bore.” In medicine, trepanation referred to making an opening in the skull, and the same root underlies trephine and trepanation. The verb's figurative sense of deceiving or outwitting was also established through English and French usage, alongside its surgical meaning.
How trepanned is actually used
The surgical sense is technical and generally formal. The sense meaning to deceive or outwit is literary and relatively uncommon, often carrying an impression of clever deception or financial trickery.
Easily confused with trepanned
A trephine is the surgical instrument used to open the skull, whereas trepanned is the past-tense verb describing the action of using such an instrument.