Probe

Part of speech: noun (n.)

An instrument for examining the depth or other circumstances of a wound, ulcer, or cavity, or the direction of a sinus, of for exploring for bullets, for stones in the bladder, etc. Parr. Probe, or Probe-pointed, scissors (Surg.), scissors used to open wounds, the blade of which, to be thrust into the orifice, has a button at the end. Wiseman.

Part of speech: verb (v.)

1. To examine, as a wound, an ulcer, or some cavity of the body, with a probe.

2. Fig.: to search to the bottom; to scrutinize or examine thoroughly. Dryden. The growing disposition to probe the legality of all acts, of the crown. Hallam.