The Collaborative International Dictionary of English v.0.48:

Thrall \Thrall\, n. [OE. thral, [thorn]ral, Icel.
   [thorn]r[ae]ll, perhaps through AS. [thorn]r[=ae]l; akin to
   Sw. tr[aum]l, Dan. tr[ae]l, and probably to AS.
   [thorn]r[ae]gian to run, Goth. [thorn]ragjan, Gr. tre`chein;
   cf. OHG. dregil, drigil, a servant.]
   1. A slave; a bondman. --Chaucer.
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            Gurth, the born thrall of Cedric.     --Sir W.
                                                  Scott.
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   2. Slavery; bondage; servitude; thraldom. --Tennyson.
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            He still in thrall
            Of all-subdoing sleep.                --Chapman.
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   3. A shelf; a stand for barrels, etc. [Prov. Eng.]
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The Collaborative International Dictionary of English v.0.48:

Thrall \Thrall\, a.
   Of or pertaining to a thrall; in the condition of a thrall;
   bond; enslaved. [Obs.] --Spenser.
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         The fiend that would make you thrall and bond.
                                                  --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Thrall \Thrall\, v. t.
   To enslave. [Obs. or Poetic] --Spenser.
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U.S. Gazetteer (1990):

Thrall, TX (town, FIPS 72824)
  Location: 30.58844 N, 97.29843 W
  Population (1990): 550 (232 housing units)
  Area: 0.9 sq km (land), 0.0 sq km (water)
  Zip code(s): 76578

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "thrall":
   absolutism, bond service, bondage, bondmaid, bondman, bondslave,
   bondsman, bondswoman, captive, captivity, chattel, chattel slave,
   churl, concubine, control, debt slave, debt slavery,
   deprivation of freedom, disenfranchisement, disfranchisement,
   domination, enslavement, enthrallment, feudalism, feudality,
   galley slave, helot, helotism, helotry, homager, indentureship,
   liege, liege man, liege subject, odalisque, peon, peonage,
   restraint, serf, serfdom, serfhood, servant, servility, servitude,
   slave, slavery, subject, subjection, subjugation, theow, thralldom,
   tyranny, vassal, vassalage, villein, villenage, yoke