bi ‧ car ‧ bon ‧ ate of so ‧ da /baɪˌkɑːbənət əv ˈsəʊdə, baɪˌkɑːbənɪt əv ˈsəʊdə, -bəneɪt- $ -ˌkɑːr-, -ˈsoʊdə/ BrE AmE ( also bicarbonate , bi‧carb informal /ˈbaɪkɑːb $ -kɑːrb/) noun [uncountable] informal
a chemical substance used especially in baking, and sometimes taken with water as a medicine SYN baking soda