The Collaborative International Dictionary of English v.0.48:

Slave \Slave\ (sl[=a]v), n. [Cf. F. esclave, D. slaaf, Dan.
   slave, sclave, Sw. slaf, all fr. G. sklave, MHG. also slave,
   from the national name of the Slavonians, or Sclavonians (in
   LL. Slavi or Sclavi), who were frequently made slaves by the
   Germans. See Slav.]
   1. A person who is held in bondage to another; one who is
      wholly subject to the will of another; one who is held as
      a chattel; one who has no freedom of action, but whose
      person and services are wholly under the control of
      another.
      [1913 Webster]

            Art thou our slave,
            Our captive, at the public mill our drudge?
                                                  --Milton.
      [1913 Webster]

   2. One who has lost the power of resistance; one who
      surrenders himself to any power whatever; as, a slave to
      passion, to lust, to strong drink, to ambition.
      [1913 Webster]

   3. A drudge; one who labors like a slave.
      [1913 Webster]

   4. An abject person; a wretch. --Shak.
      [1913 Webster]

   Slave ant (Zool.), any species of ants which is captured
      and enslaved by another species, especially Formica
      fusca of Europe and America, which is commonly enslaved
      by Formica sanguinea.

   Slave catcher, one who attempted to catch and bring back a
      fugitive slave to his master.

   Slave coast, part of the western coast of Africa to which
      slaves were brought to be sold to foreigners.

   Slave driver, one who superintends slaves at their work;
      hence, figuratively, a cruel taskmaster.

   Slave hunt.
      (a) A search after persons in order to reduce them to
          slavery. --Barth.
      (b) A search after fugitive slaves, often conducted with
          bloodhounds.

   Slave ship, a vessel employed in the slave trade or used
      for transporting slaves; a slaver.

   Slave trade, the business of dealing in slaves, especially
      of buying them for transportation from their homes to be
      sold elsewhere.

   Slave trader, one who traffics in slaves.
      [1913 Webster]

   Syn: Bond servant; bondman; bondslave; captive; henchman;
        vassal; dependent; drudge. See Serf.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slav \Slav\ (sl[aum]v or sl[a^]v), n.; pl. Slavs. [A word
   originally meaning, intelligible, and used to contrast the
   people so called with foreigners who spoke languages
   unintelligible to the Slavs; akin to OSlav. slovo a word,
   slava fame, Skr. [,c]ru to hear. Cf. Loud.] (Ethnol.)
   One of a race of people occupying a large part of Eastern and
   Northern Europe, including the Russians, Bulgarians,
   Roumanians, Servo-Croats, Slovenes, Poles, Czechs, Wends or
   Sorbs, Slovaks, etc. [Written also Slave, and Sclav.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slave \Slave\ (sl[aum]v or sl[a^]v; 277) n.
   See Slav.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slave \Slave\, v. i. [imp. & p. p. Slaved; p. pr. & vb. n.
   Slaving.]
   To drudge; to toil; to labor as a slave.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slave \Slave\, v. t.
   To enslave. --Marston.
   [1913 Webster]

WordNet (r) 3.0 (2006):

slave
    n 1: a person who is owned by someone
    2: someone who works as hard as a slave [syn: slave,
       striver, hard worker]
    3: someone entirely dominated by some influence or person; "a
       slave to fashion"; "a slave to cocaine"; "his mother was his
       abject slave"
    v 1: work very hard, like a slave [syn: slave, break one's
         back, buckle down, knuckle down]

Moby Thesaurus II by Grady Ward, 1.0:

141 Moby Thesaurus words for "slave":
   Charlie McCarthy, agent, ancilla, apple-polisher, appliance,
   ass-licker, backscratcher, backslapper, beast of burden, bondmaid,
   bondman, bondslave, bondsman, bondswoman, bootlick, bootlicker,
   brown-nose, brownie, captive, chattel, chattel slave, churl,
   clawback, concubine, contrivance, coolie, courtier, creature,
   cringer, debt slave, dependent, device, do double duty, dray horse,
   drudge, dummy, dupe, elucubrate, fag, fawner, feudatory, flatterer,
   flunky, follower, footlicker, galley slave, go-between, gofer,
   greasy grind, grind, groveler, grub, hack, handmaid, handmaiden,
   handshaker, hanger-on, helot, help, hierodule, hit the ball,
   homager, hustle, implement, inferior, instrument, interagent,
   intermediary, intermediate, intermedium, jackal, kowtower, labor,
   laborer, lackey, led captain, lever, lickspit, lickspittle, liege,
   liege man, liege subject, lucubrate, mealymouth, mechanism,
   mediator, medium, menial, midwife, minion, moil, muck, myrmidon,
   odalisque, organ, overwork, pawn, peon, plaything, plod, plodder,
   pour it on, puppet, retainer, scratch, scullion, serf, servant,
   slavey, slog, slogger, spaniel, stooge, subject, subordinate, suck,
   sweat, swot, sycophant, theow, thrall, timeserver, toad, toady,
   toil, toiler, tool, toy, truckler, tufthunter, underling,
   understrapper, vassal, vehicle, villein, work hard, work late,
   work overtime, workhorse, yeoman, yes-man



Easton's 1897 Bible Dictionary:

Slave
   Jer. 2:14 (A.V.), but not there found in the original. In Rev.
   18:13 the word "slaves" is the rendering of a Greek word meaning
   "bodies." The Hebrew and Greek words for slave are usually
   rendered simply "servant," "bondman," or "bondservant." Slavery
   as it existed under the Mosaic law has no modern parallel. That
   law did not originate but only regulated the already existing
   custom of slavery (Ex. 21:20, 21, 26, 27; Lev. 25:44-46; Josh.
   9:6-27). The gospel in its spirit and genius is hostile to
   slavery in every form, which under its influence is gradually
   disappearing from among men.


Bouvier's Law Dictionary, Revised 6th Ed (1856):

SLAVE. A man who is by law deprived of his liberty for life, and becomes the
property of another.
     2. A slave has no political rights, and generally has no civil rights.
He can enter into no contract unless specially authorized by law; what he
acquires generally, belongs to his master. The children of female slaves
follow the condition of their mothers, and are themselves slaves.
     3. In Maryland, Missouri and Virginia slaves are declared by statute to
be personal estate, or treated as such. Anth. Shep. To. 428, 494; Misso.
Laws, 558. In Kentucky, the rule is different, and they are considered real
estate. 1 Kty. Rev. Laws, 566 1 Dana's R. 94.
     4. In general a slave is considered a thing and not a person; but
sometimes he is considered as a person; as when he commits a crime; for
example, two white persons and a slave can commit a riot. 1 McCord, 534. See
Person.
     5. A slave may acquire his freedom in various ways: 1. By manumission,
by deed or writing, which must be made according to the laws of the state
where the master then acts. 1 Penn. 10; 1 Rand. 15. The deed may be absolute
which gives immediate freedom to the slave, or conditional giving him
immediate freedom, and reserving a right of service for a time to come; 6
Rand. 652; or giving him his freedom as soon as a certain condition shall
have been fulfilled. 2 Root, 364; Coxe, 4. 2. By manumission by will. When
there is an express emancipation by will, the slave will be free, and the
testator's real estate shall be charged with the payment of his debts, if
there be not enough personal property without the sale of the slaves. 9 Pet.
461. See Harper, R. 20. The manumission by will may be implied, as, where
the master devises property real or personal to his slave. 2 Pet; 670; 5
Har. & J. 190. 3. By the removal of the slave with the consent of the
master, animo morandi, into one of the United States where slavery is
forbidden by law; 2 Mart. Lo. Rep. N. J. 401; or when he sojourns there
longer than is allowed by the law of the state. 7 S. & R. 378; 1 Wash. C. C.
Rep. 499. Vide Stroud on Slavery; Bouv. Inst. Index, h.t.; and as to the
rights of one who, being free, is held as a slave, 2 Gilman, 1; 3 Yeates,
240.