trephine/trɪˈfi:n; ?@ -ˈfaɪn; trɪ`faɪn/ v[Tn](medical 医) (also trepan) cut a (small hole) in sb's skull or the cornea of the eye 在人的颅骨或眼睛角膜上开（小孔）. trephine, n (medical 医) surgeon's cylindrical saw used for this （做以上手术用的）环钻, 环锯.
牛津英汉双解词典