Definitions of probe:

• noun:   an investigation conducted using a probe instrument
• noun:   an exploratory action or expedition
• noun:   a flexible slender surgical instrument used to explore wounds or body cavities
• noun:   an inquiry into unfamiliar or questionable activities

  Example: "There was a congressional probe into the scandal"

• verb:   question or examine thoroughly and closely
• verb:   examine physically with or as if with a probe

  Example: "Probe an anthill"