The Collaborative International Dictionary of English v.0.48:

Caseous \Ca"se*ous\, a. [L. caseus. Cf. Casein.]
   Of, pertaining to, or resembling, cheese; having the
   qualities of cheese; cheesy.
   [1913 Webster]

   Caseous degeneration, a morbid process, in scrofulous or
      consumptive persons, in which the products of inflammation
      are converted into a cheesy substance which is neither
      absorbed nor organized.
      [1913 Webster]

WordNet (r) 3.0 (2006):

caseous
    adj 1: of damaged or necrotic tissue; cheeselike