- 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 sl&omacron;dh) + hound, hound (from Middle English; see hound).