From The Collaborative International Dictionary of English v.0.48 [gcide]:
Clayey \Clay"ey\, a.
Consisting of clay; abounding with clay; partaking of clay;
like clay.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
clayey
adj 1: resembling or containing clay; "argillaceous rocks" [syn:
argillaceous, clayey] [ant: arenaceous, sandlike,
sandy]
2: (used of soil) compact and fine-grained; "the clayey soil was
heavy and easily saturated" [syn: clayey, cloggy,
heavy]