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(surgery) Any of various medical instruments used to explore wounds, organs, etc.
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(figuratively) Something which penetrates something else, as though to explore; something which obtains information.
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An act of probing; a prod, a poke.
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(figuratively) An investigation or inquiry.
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(aeronautics) A tube attached to an aircraft which can be fitted into the drogue from a tanker aircraft to allow for aerial refuelling.
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(sciences) A small device, especially an electrode, used to explore, investigate or measure something by penetrating or being placed in it.
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(astronautics) A small, usually uncrewed, spacecraft used to acquire information or measurements about its surroundings.
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(go) A move with multiple possible answers, seeking to make the opponent choose and commit to a strategy.
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(biochemistry) Any group of atoms or molecules radioactively labeled in order to study a given molecule or other structure