The Collaborative International Dictionary of English v.0.48:

amyloid \am"y*loid\ ([a^]m"[i^]*loid), Amyloidal \Am`y*loid"al\
   ([a^]m`[i^]*loid"al), a. [L. amylum starch + -oid.]
   Resembling or containing starch; starchlike. --AS

   Syn: starchlike, amylaceous
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

amyloid \am"y*loid\ ([a^]m"[i^]*loid), n.
   1. A starchlike substance.
      [1913 Webster + AS]

   2. (Med.) Any of a group of diverse starchlike glycoproteins
      deposited in the organs under some pathological
      conditions, such as amyloidosis; they are composed of
      linear nonbranching fibrils when viewed under the electron
      microscope. --Stedman 25
      [1913 Webster + AS]

   Amyloid degeneration (Med.), Same as amyloidosis; --
      called also waxy degeneration or lardaceous
      degeneration.
      [1913 Webster + AS]

WordNet (r) 3.0 (2006):

amyloid
    adj 1: resembling starch [syn: starchlike, amylaceous,
           amyloid, amyloidal, farinaceous]
    n 1: a non-nitrogenous food substance consisting chiefly of
         starch; any substance resembling starch
    2: (pathology) a waxy translucent complex protein resembling
       starch that results from degeneration of tissue