alginic acid or one of its esters or salts, esp the gelatinous solution obtained as a by-product in the extraction of iodine from seaweed, used in mucilages and for thickening jellies
algin in American English
(ˈældʒɪn)
noun
1.
alginic acid
2.
a colloidal polysaccharide derived from alginic acid and used as a stabilizer and emulsifier, esp. in ice cream