1. virus   poisonous element that communicates infection.   substance that causes solid matter in solution to deposit.   smallest particle of a substance with all its properties.   unit for measuring light energy.   Hint Half-n-half Clue   2. parallelism   similarity or state of being parallel.   tool for pounding or grinding in a mortar.   increase.   bending of a ray of light due to change in density.   Half-n-half Clue   3. vise   band of colors formed when light passes though a prism.   tool with jaws for holding work.   change or introduction of novelties.   harmless substance given as dummy medicine.   Half-n-half Clue   4. mirage   small outlet or inlet.   breathing.   optical illusion due to atmospheric conditions.   navigational instrument for angular measurements.   Half-n-half Clue   5. vortex   point in moon's orbit nearest from earth.   discovery by accident.   sameness or consistency.   center of turbulence or whirling motion.   Half-n-half Clue   6. sextant   capability to be shaped and molded.   navigational instrument for angular measurements.   small outlet or inlet.   product of mass and velocity for a moving body; impetus.   Half-n-half Clue   7. symmetry   pattern with balance or harmony.   similarity or state of being parallel.   flying reptile now extinct.   increase.   Half-n-half Clue