1. size or extent.   parasite   magnitude   solstice   spatula   Hint Half-n-half Clue   2. similarity or state of being parallel.   stratum   pestle   parallelism   trough   Half-n-half Clue   3. coloring agent.   terminology   pigment   repulsion   serendipity   Half-n-half Clue   4. band of colors formed when light passes though a prism.   uniformity   stratum   summation   spectrum   Half-n-half Clue   5. point in moon's orbit nearest from earth.   perigee   respiration   objective   parameter   Half-n-half Clue   6. outer boundary for closed figure.   synthesis   mirage   perimeter   iota   Half-n-half Clue   7. sleeplessness.   molecule   insomnia   medium   terminology   Half-n-half Clue