haitsai

\\ˈhīˈtsī\ noun (-s)

Etymology: Chinese (Pekingese) hai³-t'sai⁴, from hai³ sea + t'sai⁴ herb, green vegetable

1. : a transparent gelatinous substance prepared from a red alga (Gloiopeltis tenax) and used by the Chinese for lanterns and windows and for stiffening cloth

2. : the alga that yields haitsai