mekabu noun2 •Undaria pinnatifida, a sea plant native to Japan and Korea and invasive elsewhere; wakame; Asian kelp.We previously reported that water extract of Mekabu, a kind of seaweed, induced apoptosis in a human breast cancer cell line. — 2005 •Stems or thick leaves from near the stem of the plant, eaten as a vegetable.Mekabu is the flowering sprout of wakame. It has a strong, sweet, and creamy taste and is traditionally brewed into a tea or cooked in small amounts with other foods. — 1985