1. tooth of a wheel.   catalyst   dissertation   cog   dichotomy   Hint Half-n-half Clue   2. mode of formation or origin.   apogee   astigmatism   genesis   dichotomy   Half-n-half Clue   3. conjecture or logical projection beyond range.   effervescence   extrapolation   catalyst   emollient   Half-n-half Clue   4. degeneration; humiliation.   imbalance   degradation   flora   clavicle   Half-n-half Clue   5. post-mortem or examination of dead body.   balm   equilibrium   chassis   autopsy   Half-n-half Clue   6. confused state of mind.   analogy   delirium   catharsis   apothecary   Half-n-half Clue   7. tree bearing fruit-cones.   galaxy   component   conifer   extrapolation   Half-n-half Clue