explorer

noun

1. One who explores something
2. A person who by means of travel (notably an expedition) searches out new information.

   “Though now extinct, the rachni once threatened every species in Citadel space. Over 2000 years ago, explorers foolishly opened a mass relay to a previously-unknown system and encountered something never seen before or since: a species of spacefaring insects guided by a hive-mind intelligence.”

3. Any of various hand tools, with sharp points, used in dentistry.
4. A visual representation of a file system etc. through which the user can navigate.

   “For example, Vista includes a document explorer that shows just the documents in a location without considering all of the other files that might appear there.”

5. (US)A participant in the Exploring program, which focuses on career exploration.
6. (US)A participant in the Fire Service Exploring program.