[tre.pan] vt tre.panned ; tre.pan.ning [ME, fr. trepane trephine] (15c) 1: to use a trephine on (the skull)
2: to remove a disk or cylindrical core (as from metal for testing) -- trep.a.na.tion n
[2]tre.pan n [ME trepane trephine, fr. ML trepanum, fr. Gk trypanon auger, fr. trypan to bore] (ca. 1877): a heavy tool used in boring mine shafts [3]tre.pan n [origin unknown] (1641) 1 archaic: trickster
2. archaic: a deceptive device: snare [4]tre.pan vt tre.panned ; tre.pan.ning (ca. 1656) archaic: entrap, lure