Definitions
1.NounAny material that forms a colloid (especially a gel) when mixed with water.
2.NounAny of a broad subclass of such materials that are of biologic origin or importance, most being biopolymers such as polysaccharides or proteins.
Such a material, made from agar, used to make dental impressions.
3.NounSuch a material, made from agar, used to make dental impressions.