The Collaborative International Dictionary of English v.0.48:

Spit \Spit\, v. t. [imp. & p. p. Spit (Spat, archaic); p.
   pr. & vb. n. Spitting.] [AS. spittan; akin to G.
   sp["u]tzen, Dan. spytte, Sw. spotta,Icel. sp?ta, and prob. E.
   spew. The past tense spat is due to AS. sp?tte, from sp?tan
   to spit. Cf. Spat, n., Spew, Spawl, Spot, n.]
   1. To eject from the mouth; to throw out, as saliva or other
      matter, from the mouth. "Thus spit I out my venom."
      --Chaucer.
      [1913 Webster]

   2. To eject; to throw out; to belch.
      [1913 Webster]

   Note: Spitted was sometimes used as the preterit and the past
         participle. "He . . . shall be mocked, and spitefully
         entreated, and spitted on." --Luke xviii. 32.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spat \Spat\,
   imp. of Spit. [Obs. or R.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spat \Spat\, n. [From the root of spit; hence, literally, that
   which is ejected.]
   A young oyster or other bivalve mollusk, both before and
   after it first becomes adherent, or such young, collectively.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spat \Spat\, v. i. & t.
   To emit spawn; to emit, as spawn.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spat \Spat\, n. [Cf. Pat.]
   1. A light blow with something flat. [U.S. & Prov. Eng.]
      [1913 Webster]

   2. Hence, a petty combat, esp. a verbal one; a little
      quarrel, dispute, or dissension. [U. S.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spat \Spat\, v. i.
   To dispute. [R.] --Smart.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spat \Spat\, v. t. [imp. & p. p. Spatted; p. pr. & vb. n.
   Spatting.]
   To slap, as with the open hand; to clap together; as the
   hands. [Local, U.S.]
   [1913 Webster]

         Little Isabel leaped up and down, spatting her hands.
                                                  --Judd.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spat \Spat\, n. [Short for Spatterdash.]
   1. A legging; a gaiter. [Scot. & Dial. Eng.]
      [Webster 1913 Suppl.]

   2. A kind of short cloth or leather gaiter worn over the
      upper part of the shoe and fastened beneath the instep; --
      chiefly in pl.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

spat
    n 1: a quarrel about petty points [syn: bicker, bickering,
         spat, tiff, squabble, pettifoggery, fuss]
    2: a cloth covering (a legging) that covers the instep and
       ankles [syn: spat, gaiter]
    3: a young oyster or other bivalve
    v 1: come down like raindrops; "Bullets were spatting down on
         us"
    2: become permanently attached; "mollusks or oysters spat"
    3: strike with a sound like that of falling rain; "Bullets were
       spatting the leaves"
    4: clap one's hands or shout after performances to indicate
       approval [syn: applaud, clap, spat, acclaim] [ant:
       boo, hiss]
    5: engage in a brief and petty quarrel
    6: spawn; "oysters spat"
    7: clap one's hands together; "The children were clapping to the
       music" [syn: clap, spat]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "spat":
   altercate, altercation, argument, beef, bicker, bickering,
   blood feud, box, brawl, broil, brood, buffet, burst, caterwaul,
   chop, clutch, contention, controversy, differ, dispute, donnybrook,
   donnybrook fair, embroilment, fall, falling-out, farrow, feud,
   fight, flite, fliting, fracas, fry, fuss, get, hassle, hatch,
   have words, imbroglio, join issue, litter, logomachy, miff, nest,
   open quarrel, paste, polemic, punch, quarrel, set to, sharp words,
   slanging match, slap, smack, snarl, spar, spawn, squabble, strife,
   swack, tiff, tussle, vendetta, words, wrangle, young



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SPAT
       Speech Pronunciation Analysis Training (Uni Mainz), "S.P.A.T."