- A slender rod of rigid or flexible material, with a blunt bulbous tip, used for exploring sinuses, fistulae, other cavities, or wounds.
- A device or agent used to detect or explore a substance (a molecule used to detect the presence of a specific fragment of DNA or RNA or of a specific bacterial colony).
- To enter and explore, as with a probe.
[L. probo, to test]
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Examples: glitazone, GI cocktail, etc.