The Collaborative International Dictionary of English v.0.48:

Annulate \An"nu*late\, Annulated \An"nu*la`ted\a. [L.
   annulatus.]
   1. Furnished with, or composed of, rings; ringed; surrounded
      by rings of color.
      [1913 Webster]

   2. (Zool.) Of or pertaining to the Annulata.
      [1913 Webster]

WordNet (r) 3.0 (2006):

annulated
    adj 1: shaped like a ring [syn: annular, annulate,
           annulated, circinate, ringed, ring-shaped,
           doughnut-shaped]