Algin

noun

1. Any of several derivatives, such as sodium alginate or alginic acid, of a gelatinous polysaccharide extracted from certain brown algae and widely used as a thickening, stabilizing, emulsifying, or suspending agent in industrial, pharmaceutical, and food products, such as ice cream.
2. A mucilaginous substance obtained from certain algæ, Laminaria stenophylla and L. digitata.
3. A nitrogenous substance resembling gelatin, obtained from certain algæ.
4. Any of various gelatinous gums, derivatives of alginic acid, derived from algae.
5. a gum used especially as a thickener or emulsifier