1. ability to produce desired effect.   apothecary   aperture   efficacy   fauna   Hint Half-n-half Clue   2. substance producing condition of no sensation.   anesthetic   dissection   carat   cataract   Half-n-half Clue   3. state of being motionless.   equilibrium   correlation   antiseptic   immobility   Half-n-half Clue   4. spread of disease by contact.   delta   contagion   conglomeration   astigmatism   Half-n-half Clue   5. conjecture or logical projection beyond range.   extrapolation   flora   alchemy   immobility   Half-n-half Clue   6. mode of formation or origin.   genesis   cataract   conglomeration   clavicle   Half-n-half Clue   7. botanical garden where trees are studied and exhibited.   cerebration   aperture   arboretum   anesthetic   Half-n-half Clue