- Archaic a dog, as a bloodhound, able to follow a trail by scent
- Informal a keen detective or investigator
- A dog used for tracking or pursuing, such as a bloodhound.
- A detective.
Origin of sleuthhoundScots sleuth hound sleuth track, trail ( from Middle English sloth ) ( from Old Norse slōdh ) hound hound ( from Middle English; see hound . )