1. similarity or state of being parallel.   parallelism   incline   miasma   whorl   Hint Half-n-half Clue   2. primary type used as model.   quagmire   prototype   parameter   parasite   Half-n-half Clue   3. sameness or consistency.   strut   virus   uniformity   respiration   Half-n-half Clue   4. point in moon's orbit nearest from earth.   torque   perigee   metamorphosis   velocity   Half-n-half Clue   5. lowest point in wave; shallow receptacle.   trough   pigment   lumen   vent   Half-n-half Clue   6. combining elements to produce whole system.   perigee   medium   synthesis   miasma   Half-n-half Clue   7. outer boundary for closed figure.   perimeter   psychosis   perigee   serendipity   Half-n-half Clue