slaver (n.)

"ship in the slave trade," 1830, agent noun from slave (v.). Meaning "person in the slave trade" is from 1842.

slaver (v.)

"dribble from the mouth," early 14c., from Old Norse slafra "to slaver," probably imitative (compare slobber (v.)). Related: Slavered; slavering. The noun is from early 14c.