1. point in moon's orbit nearest from earth.   nutrient   perigee   parallelism   incline   Hint Half-n-half Clue   2. thick-skinned animal (or person).   symmetry   nutrient   pachyderm   torque   Half-n-half Clue   3. stone to test gold alloys; criterion.   nomenclature   miasma   placebo   touchstone   Half-n-half Clue   4. navigational instrument for angular measurements.   inconsistency   sextant   pestle   refraction   Half-n-half Clue   5. center of turbulence or whirling motion.   miasma   placebo   microcosm   vortex   Half-n-half Clue   6. harmless substance given as dummy medicine.   metamorphosis   strut   placebo   quagmire   Half-n-half Clue   7. missile or shell.   projectile   lumen   pestle   sextant   Half-n-half Clue