/ah"gahr, ag"euhr/ , n.
1. Also, agar-agar . Also called Chinese gelatin, Chinese isinglass, Japanese gelatin, Japanese isinglass . a gelatinlike product of certain seaweeds, used for solidifying certain culture media, as a thickening agent for ice cream and other foods, as a substitute for gelatin, in adhesives, as an emulsifier, etc.
2. Biol. a culture medium having an agar base.
[ 1885-90; agaragar seaweed from which a gelatin is rendered, or the gelatin itself ]