Source : Webster's Revised Unabridged Dictionary (1913)

Clayey \Clay"ey\, a.
   Consisting of clay; abounding with clay; partaking of clay;
   like clay.

Source : WordNet®

clayey
     adj 1: resembling or containing clay; "argillaceous rocks" [syn: {argillaceous}]
            [ant: {arenaceous}]
     2: (used of soil) compact and fine-grained; "the clayey soil
        was heavy and easily saturated" [syn: {cloggy}, {heavy}]