1. thick-skinned animal (or person).   pachyderm   marsupial   projectile   solvent   Hint Half-n-half Clue   2. different form of an element.   inconsistency   momentum   perigee   isotope   Half-n-half Clue   3. similarity or state of being parallel.   parallelism   whorl   marsupial   synthesis   Half-n-half Clue   4. ring (of leaves around the stem).   syllogism   whorl   suture   miasma   Half-n-half Clue   5. supporting bar in framework or pompous walk.   synthesis   yield   strut   perimeter   Half-n-half Clue   6. flying reptile now extinct.   placebo   parameter   pterodactyl   perimeter   Half-n-half Clue   7. slope or slanting plane.   torque   incline   microcosm   phenomenon   Half-n-half Clue