The Collaborative International Dictionary of English v.0.48:

Tear \Tear\ (t[^a]r), v. t. [imp. Tore (t[=o]r), ((Obs.
   Tare) (t[^a]r); p. p. Torn (t[=o]rn); p. pr. & vb. n.
   Tearing.] [OE. teren, AS. teran; akin to OS. farterian to
   destroy, D. teren to consume, G. zerren to pull, to tear,
   zehren to consume, Icel. t>ae/ra, Goth. gata['i]ran to
   destroy, Lith. dirti to flay, Russ. drate to pull, to tear,
   Gr. de`rein to flay, Skr. dar to burst. [root]63. Cf. Darn,
   Epidermis, Tarre, Tirade.]
   1. To separate by violence; to pull apart by force; to rend;
      to lacerate; as, to tear cloth; to tear a garment; to tear
      the skin or flesh.
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            Tear him to pieces; he's a conspirator. --Shak.
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   2. Hence, to divide by violent measures; to disrupt; to rend;
      as, a party or government torn by factions.
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   3. To rend away; to force away; to remove by force; to
      sunder; as, a child torn from its home.
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            The hand of fate
            Hath torn thee from me.               --Addison.
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   4. To pull with violence; as, to tear the hair.
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   5. To move violently; to agitate. "Once I loved torn ocean's
      roar." --Byron.
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   To tear a cat, to rant violently; to rave; -- especially
      applied to theatrical ranting. [Obs.] --Shak.

   To tear down, to demolish violently; to pull or pluck down.


   To tear off, to pull off by violence; to strip.

   To tear out, to pull or draw out by violence; as, to tear
      out the eyes.

   To tear up, to rip up; to remove from a fixed state by
      violence; as, to tear up a floor; to tear up the
      foundation of government or order.
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The Collaborative International Dictionary of English v.0.48:

Tare \Tare\, v. t. [imp. & p. p. Tared; p. pr. & vb. n.
   Taring.]
   To ascertain or mark the tare of (goods).
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The Collaborative International Dictionary of English v.0.48:

Tare \Tare\, obs. imp. of Tear.
   Tore.
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The Collaborative International Dictionary of English v.0.48:

Tare \Tare\, n. [Cf. Prov. E. tare brisk, eager, OE. tarefitch
   the wild vetch.]
   1. A weed that grows among wheat and other grain; -- alleged
      by modern naturalists to be the Lolium temulentum, or
      darnel.
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            Didst not thou sow good seed in thy field? From
            whence then hath it tares?            --Matt. xiii.
                                                  27.
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            The "darnel" is said to be the tares of Scripture,
            and is the only deleterious species belonging to the
            whole order.                          --Baird.
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   2. (Bot.) A name of several climbing or diffuse leguminous
      herbs of the genus Vicia; especially, the Vicia
      sativa, sometimes grown for fodder.
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The Collaborative International Dictionary of English v.0.48:

Tare \Tare\, n. [F. tare; cf. Pr., Sp., Pg., & It. tara; all fr.
   Ar. tarah thrown away, removed, fr. taraha to reject,
   remove.] (Com.)
   Deficientcy in the weight or quantity of goods by reason of
   the weight of the cask, bag, or whatever contains the
   commodity, and is weighed with it; hence, the allowance or
   abatement of a certain weight or quantity which the seller
   makes to the buyer on account of the weight of such cask,
   bag, etc.
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WordNet (r) 3.0 (2006):

tare
    n 1: an adjustment made for the weight of the packaging in order
         to determine the net weight of the goods
    2: any of several weedy vetches grown for forage
    3: weedy annual grass often occurs in grainfields and other
       cultivated land; seeds sometimes considered poisonous [syn:
       darnel, tare, bearded darnel, cheat, Lolium
       temulentum]
    4: the weight of a motor vehicle, railroad car, or aircraft
       without its fuel or cargo
    5: (chemical analysis) a counterweight used in chemical
       analysis; consists of an empty container that counterbalances
       the weight of the container holding chemicals

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "tare":
   abatement, agio, allowance, bank discount, bones, breakage,
   cash discount, chaff, chain discount, charge-off, concession, culm,
   cut, deadwood, deduction, depreciation, discount, dishwater, draff,
   drawback, dregs, dust, filings, garbage, gash, hogwash, husks,
   kickback, leavings, lees, offal, offscourings, orts, parings,
   penalty, penalty clause, percentage, potsherds, premium,
   price reduction, price-cut, rags, raspings, rebate, rebatement,
   reduction, refund, refuse, rollback, salvage, scourings,
   scrap iron, scraps, scum, setoff, shards, shavings, slack, slag,
   slop, slops, stubble, sweepings, swill, tares, time discount,
   trade discount, tret, underselling, wastage, waste, waste matter,
   wastepaper, weeds, write-off



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

TARE, weights. An allowance in the purchase and sale of merchandise, for the
weight of the box, bag, or cask, or other thing, in which the goods are
packed. It is also an allowance made for tiny defect, waste, or diminution
in the weight, quality or quantity of goods. It differs from tret. (q.v.)