Noun
a gum used especially as a thickener or emulsifier
Source: WordNetCommonly, following ingestion a 'raft' of alginic acid is created, floating on the stomach contents by carbon dioxide released by the drug. Source: Internet
Formulations Antacids may be formulated with other active ingredients like simethicone to control gas or alginic acid to act as a physical barrier to acid. Source: Internet