1. formal discourse or essay.   extrapolation   chameleon   dissertation   flora   Hint Half-n-half Clue   2. loss of speech.   aphasia   conduit   equilibrium   balm   Half-n-half Clue   3. tree bearing fruit-cones.   conifer   foliage   cog   humus   Half-n-half Clue   4. point in orbit farthest from earth or climax.   emetic   correlation   apogee   dissection   Half-n-half Clue   5. working of the brain or thought.   cistern   congruence   cerebration   cog   Half-n-half Clue   6. drug that reduces pain.   correlation   anodyne   acoustics   autopsy   Half-n-half Clue   7. machine to separate substances by spinning.   assumption   astigmatism   eddy   centrifuge   Half-n-half Clue