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.]
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The Collaborative International Dictionary of English v.0.48:

Slaver \Slav"er\, n.
   1. A vessel engaged in the slave trade; a slave ship.
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   2. A person engaged in the purchase and sale of slaves; a
      slave merchant, or slave trader.
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            The slaver's hand was on the latch,
            He seemed in haste to go.             --Longfellow.
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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.
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   2. To be besmeared with saliva. --Shak.
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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.
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The Collaborative International Dictionary of English v.0.48:

Slaver \Slav"er\, n.
   Saliva driveling from the mouth.
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         Of all mad creatures, if the learned are right,
         It is the slaver kills, and not the bite. --Pope.
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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]