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acid made of or containing an acid. [1/4 definitions]
acid rain rain that contains acid from pollution.
DNA a substance found in cells that contains information about the characteristics of a living thing. DNA plays a part in the passing on of characteristics from parent to offspring. "DNA" is an abbreviation of "deoxyribonucleic acid."
etch to create a picture, design or lettering on a hard surface such as glass or metal by removing parts of the surface with acid.
ferment When a solid or liquid food ferments, the natural sugars contained in the food change to other substances, such as alcohol or acids. Fermenting occurs when some form of bacteria or yeast is added to the food or somehow gets into it. People use the process of fermenting to create certain foods and beverages. Yogurt is a food that is made by fermenting. Yogurt starts out as milk, which has a natural sugar in it called "lactose." A certain kind of bacteria is added to the milk to make it ferment. When the milk ferments, some of the lactose changes into an acid. That's why yogurt has a kind of sour taste.
litmus paper a small strip of treated paper used in chemistry. Litmus paper turns red in an acid and blue in a base.
moor1 an area of land that is open and wet. Heather and other plants that need acid soil grow on moors.
neutral neither an acid nor a base in chemistry. [1/4 definitions]
salt a chemical substance that is made by replacing an acid with a base. [1/5 definitions]
sour having a tart or acid taste like lemon juice or vinegar. [2/7 definitions]
tart1 sour or acid in taste; sharp; biting.