/yah yoy"/ , adj.
of or pertaining to a cultural period in Japan, c300 B.C.-A.D. c300, characterized by unglazed reddish clay pottery (Yayoiware) made on a wheel and noted for its restrained, undecorated style, haniwa figures, raised-floor dwellings, wet-rice agriculture, and the first use of bronze and iron.
[ Yayoi site of a tumulus where the pottery was discovered in 1884 ]