The Collaborative International Dictionary of English v.0.48:

Tabby \Tab"by\ (t[a^]b"b[y^]), n.; pl. Tabbies
   (t[a^]b"b[i^]z). [F. tabis (cf. It. tab[`i], Sp. & Pg.
   tab['i], LL. attabi), fr. Ar. 'att[=a]b[imac], properly the
   name of a quarter of Bagdad where it was made, the quarter
   being named from the prince Attab, great grandson of Omeyya.
   Cf. Tobine.]
   1. A kind of waved silk, usually called watered silk,
      manufactured like taffeta, but thicker and stronger. The
      watering is given to it by calendering.
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   2. A mixture of lime with shells, gravel, or stones, in equal
      proportions, with an equal proportion of water. When dry,
      this becomes as hard as rock. --Weale.
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   3. A brindled cat; hence, popularly, any cat.
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   4. An old maid or gossip. [Colloq.] --Byron.
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