1. lowest point in wave; shallow receptacle.   precipitant   trough   virus   sextant   Hint Half-n-half Clue   2. substance which provides nourishment.   perigee   miasma   nutrient   quadruped   Half-n-half Clue   3. quantity that can be defined or that can limit.   parameter   psychosis   propellant   respiration   Half-n-half Clue   4. speed or rate of motion.   quadruped   velocity   placebo   pterodactyl   Half-n-half Clue   5. tool for pounding or grinding in a mortar.   lumen   strut   pestle   nomenclature   Half-n-half Clue   6. stitching of parts at their edges; thread or wire.   suture   parameter   prototype   momentum   Half-n-half Clue   7. reasoning with major premise, minor premise and conclusion.   miasma   syllogism   torque   isotope   Half-n-half Clue