a person or thing that explores.

a person who investigates unknown regions

the great explorers of the Renaissance.

any instrument used in exploring or sounding a wound, a cavity in a tooth, or the like.

( initial capital letter ) Also called Explorer Scout. a person between the ages 14 and 20 who is an active participant in the exploring program sponsored by the Boy Scouts of America.

( initial capital letter ) Aerospace . one of a long series of U.S. scientific satellites

Explorer 1 (1958) was the first U.S. artificial satellite.

noun

adventurer , experimenter , inquisitive person , pathfinder , pilgrim , pioneer , searcher , seeker , traveler