The Collaborative International Dictionary of English v.0.48:

Pitted \Pit"ted\ (p[i^]t"t[e^]d), a.
   1. Marked with little pits, as in smallpox. See Pit, v. t.,
      2.
      [1913 Webster]

   2. (Bot.) Having minute thin spots; as, pitted ducts in the
      vascular parts of vegetable tissue.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pit \Pit\, v. t. [imp. & p. p. Pitted; p. pr. & vb. n.
   Pitting.]
   1. To place or put into a pit or hole.
      [1913 Webster]

            They lived like beasts, and were pitted like beasts,
            tumbled into the grave.               --T. Grander.
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   2. To mark with little hollows, as by various pustules; as, a
      face pitted by smallpox.
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   3. To introduce as an antagonist; to set forward for or in a
      contest; as, to pit one dog against another.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pitted
    adj 1: pitted with cell-like cavities (as a honeycomb) [syn:
           alveolate, faveolate, cavitied, honeycombed,
           pitted]