The Collaborative International Dictionary of English v.0.48:

Slabber \Slab"ber\, v. i. [imp. & p. p. Slabbered; p. pr. &
   vb. n. Slabbering.] [OE. slaberen; akin to LG. & D.
   slabbern, G. schlabbern, LG. & D. slabben, G. schlabben,
   Icel. slafra. Cf. Slaver, Slobber, Slubber.]
   To let saliva or some liquid fall from the mouth carelessly,
   like a child or an idiot; to drivel; to drool. [Written also
   slaver, and slobber.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slaver \Slav"er\, n.
   1. A vessel engaged in the slave trade; a slave ship.
      [1913 Webster]

   2. A person engaged in the purchase and sale of slaves; a
      slave merchant, or slave trader.
      [1913 Webster]

            The slaver's hand was on the latch,
            He seemed in haste to go.             --Longfellow.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slaver \Slav"er\, v. i. [imp. & p. p. Slavered; p. pr. & vb.
   n. Slavering.] [Cf. Icel. slafra. See Slabber.]
   1. To suffer spittle, etc., to run from the mouth.
      [1913 Webster]

   2. To be besmeared with saliva. --Shak.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slaver \Slav"er\, v. t.
   To smear with saliva issuing from the mouth; to defile with
   drivel; to slabber.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slaver \Slav"er\, n.
   Saliva driveling from the mouth.
   [1913 Webster]

         Of all mad creatures, if the learned are right,
         It is the slaver kills, and not the bite. --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

slaver
    n 1: a person engaged in slave trade [syn: slaver, slave
         dealer, slave trader]
    2: someone who holds slaves [syn: slaveholder, slave owner,
       slaver]
    v 1: let saliva drivel from the mouth; "The baby drooled" [syn:
         drivel, drool, slabber, slaver, slobber,
         dribble]

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "slaver":
   adulate, apple-polish, babble, be insane, beslobber, beslubber,
   blandish, bootlick, cajole, compliment, conceit, cower, cringe,
   dote, dribble, drivel, drool, expectorate, expectoration,
   fawn upon, flatter, foam, froth, grovel, have a demon, hawk,
   kowtow, make fair weather, mouth-watering, nonsense,
   oil the tongue, palaver, panderer, piffle, pimp, praise, ptyalism,
   rage, ramble, rant, rave, rubbish, run amok, run mad, saliva,
   salivate, salivation, sialagogue, slabber, slobber, slobber over,
   spew, spit, spittle, sputum, toady, truckle, twaddle, wander,
   water, wheedle