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| a chattering or flighty, light-headed person. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
antacid ant·ac·id (ānt-ās'ĭd) or an·ti·ac·id (ān'tē-ās'ĭd, ān'tī-)
adj.
Counteracting or neutralizing acidity, especially of the stomach. n.
A substance, such as sodium bicarbonate, that neutralizes acid.