Return to Book List Grade 8     Glossary   Choose a Letter | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |   List of words for Letter 'B' Click on    to hear the word and definition. bacteria (bak•TIR•ee•uh) Single-celled microorganisms that live nearly everywhere; bacterium (sing.)   balanced budget A plan in which your income is equal to or greater than your expenses.   barbiturates (bar•BI•chuh•ruhts) A type of sedative that has been prescribed by physicians to help people sleep.   being drug free Not misusing over-the-counter and controlled drugs and not using any illegal drugs   binge eating disorder An eating disorder in which the affected person engages in uncontrollable overeating.   biodegradable Able to be broken down by organisms to become part of Earth's natural resources.   biological age A measure of age based on how well a person's body parts are functioning.   biopsy The removal of a tissue sample to check for the presence of cancer cells.   birth defect An abnormality present at birth that can cause physical or mental disability, or death.  blackout A period during which a person cannot remember what has happened.   Leave Glossary