The Collaborative International Dictionary of English v.0.48:

Mucoid \Mu"coid\, a. [Mucus + -oid.]
   Resembling mucus. --Dunglison.
   [1913 Webster]

   Mucoid degeneration, a form of degeneration in which the
      tissues are transformed into a semisolid substance
      resembling mucus. --Quain.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mucoid \Mu"coid\, n. [Mucin + -oid.] (Physiol. Chem.)
   One of a class of mucinlike substances yielding on
   decomposition a reducing carbohydrate together with some form
   of proteinaceous matter.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

mucoid
    adj 1: relating to or resembling mucus; "a mucoid substance"
           [syn: mucoid, mucoidal]
    n 1: any of several glycoproteins similar to mucin