Source : Webster's Revised Unabridged Dictionary (1913)

Cancellous \Can"cel*lous\, a. [Cf. L. cancellosus covered with
   bars.] (Anat.)
   Having a spongy or porous structure; made up of cancelli;
   cancellated; as, the cancellous texture of parts of many
   bones.

Source : WordNet®

cancellous
     adj : having an open or latticed or porous structure [syn: {cancellate},
            {cancellated}]