1. spread of disease by contact.   flora   contagion   catalyst   delta   Hint Half-n-half Clue   2. continuous flow or series of changes.   floe   fissure   flux   eddy   Half-n-half Clue   3. secret code used to encrypt messages.   dichotomy   cipher   converse   efficacy   Half-n-half Clue   4. deviation from center or oddity.   apothecary   antiseptic   atavism   eccentricity   Half-n-half Clue   5. point on which lever is supported.   anodyne   autopsy   fulcrum   flora   Half-n-half Clue   6. device used to maintain equilibrium.   gyroscope   emetic   asteroid   cerebration   Half-n-half Clue   7. small pricking tool for piercing holes.   centrifuge   awl   diminution   correlation   Half-n-half Clue