- 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.
- a person between the ages 14 and 20 who is an active participant in the exploring program sponsored by the Boy Scouts of America.
- one of a long series of U.S. scientific satellites: Explorer 1 (1958) was the first U.S. artificial satellite.
- a member of the senior branch of the Scouts
- any of the first series of US satellites. Explorer 1, launched in 1958, confirmed the existence of intense radiation belts around the earth
