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Based on Merriam-Webster's Collegiate® Dictionary
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purine.noun
a colorless crystalline organic base, C5H4N4 (5 parts {molecules} carbon, 4 parts hydrogen, 4 parts nitrogen), that is the parent compound of various biologically important derivatives; any of a group of organic compounds derived from or structurally related to purine, including uric acid, caffeine, and the nucleic acids constituents adenine and guanine

phyllotaxy-or-phyllotaxis.noun,.plural.phyllotaxies also phyllotaxes
the arrangement of leaves on a stem; the geometric and numerical principles governing patterns of leaf arrangement
phyllotactic or phyllotactical.adjective

propitious.adjective
presenting favorable circumstances; auspicious; favorable; kindly; gracious propitiously.adverb
propitiousness.noun

plaster of Paris.noun
any of a group of gypsum cements, essentially hemihydrated calcium sulfate, CaSO4.½H2O, a white powder that forms a paste when mixed with water and hardens into a solid, used in making casts, molds, and sculpture

posit, posited, positing, posits.transitive verbs
to put forward, as for consideration or study; suggest; to affirm or assume the existence of; postulate

prescribe, prescribed, prescribing, prescribes.verbs
transitive verb use.to set down as a rule or guide; enjoin; dictate; to order the use of (a medicine or other treatment)
intransitive verb use.to establish rules, laws, or directions; to order a medicine or other treatment; to assert a right or title to something on the grounds of prescription
prescriber.noun

pert, perter, pertest.adjective
trim and stylish in appearance; jaunty (a pert hat); high spirited; vivacious; saucy
pertly.adverb
pertness.noun

pusillanimous.adjective
lacking courage; cowardly
pusillanimously.adverb

provision.noun
the act of supplying or fitting out; something provided; a preparatory action or measure; provisions; a stock of necessary supplies, especially food; a stipulation or qualification, especially a clause in a document or an agreement
transitive verbs.provision, provisioned, provisioning, provisions
to supply with provisions
provisioner.noun

provisional.adjective
provided or serving only for the time being; temporary
provisional.noun
a person hired temporarily for a job, typically before having taken an examination qualifying the person for permanent employment (police and fire department provisionals)
provisionally.adverb

pH.noun
Chemistry..a measure of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing with increasing alkalinity and decreasing with increasing acidity. The pH scale commonly in use measures ranges from 0 to 14.

permeable.adjective
that can be permeated or penetrated, especially by liquids or gases (permeable membranes; rock that is permeable by water)
permeably.adverb

pion.noun
Physics..a semistable meson produced either in a neutral form with a mass 264 times that of an electron and a mean (average) lifetime of 8.4 × 1017 second or in a positively charged form with a mass 273 times that of an electron and a mean lifetime of 2.6 × 108 second. Also called pi meson

proclaim, proclaimed, proclaiming, proclaims.transitive verbs
to announce; declare; to indicate conspicuously; make plain (wearing a button that proclaimed my choice for class president); to praise; extol

predicament.noun
a situation, especially an unpleasant, troublesome, or trying one, from which extrication is difficult; plight; dilemma
predicamental.adjective
predicamentally.adverb

peril.noun
imminent danger; exposure to the risk of harm or loss; something that endangers or involves risk
peril, periled, periling, perils.transitive verbs
to expose to danger or the chance of injury; imperil

perilous.adjective
full of or involving peril; dangerous
perilously.adverb
perilousness.noun

permanent.adjective
lasting or remaining without essential change (the universe though always changing yet remains; a permanent address) 
permanent.noun
a long lasting hair wave produced by applying a chemical lotion to the hair while wet, winding the hair on rollers and drying it with heat, also called permanent wave
permanently.adverb
permanentness.noun

purify, purified, purifying, purifies.verbs
transitive verb use.to rid of impurities; cleanse; to rid of foreign or objectionable elements
intransitive verb use.to become clean or pure
purificatory.adjective
purifier.noun

pledge.noun
a solemn binding promise to do, give, or refrain from doing something (signed a pledge to donate regularly); a pledge of money to a charity
pledge, pledged, pledging, pledges.verbs
transitive verb use.to offer or guarantee by a solemn binding promise (pledged their cooperation to help the disadvantaged); devote; promise
intransitive verb use.to make a solemn binding promise

pilaster.noun
Architecture.-.a rectangular column with a capital and base, set into a wall as an ornamental motif

pant, panted, panting, pants.verbs
intransitive verb use.to breathe rapidly in short gasps, as after exertion; to long demonstratively; yearn.(was panting for a chance to play); to give off loud puffs, especially while moving;  transitive verb use.to utter hurriedly or breathlessly (I panted my congratulations to the winner of the race)
pant.noun
a short, labored breath; a gasp; a short, loud puff, as of steam from an engine
pantingly.adverb
pant.noun,.plural.pants
trousers; used in the plural; underpants
with (one's) pants down.idiom
in an embarrassing position

portray, portrayed, portraying, portrays.transitive verbs
to depict or represent pictorially; make a picture of; to depict or describe in words; to represent dramatically, as on the stage
portrayable.adjective
portrayer.noun

prevent, prevented, preventing, prevents.verbs
transitive verb use.to keep from happening (took steps to prevent any chance of vehicle breakdown before the trip); to keep someone from doing something; impede.(prevented us from going outside the safe ski area); to anticipate or counter in advance; to come before; precede
intransitive verb use.to present an obstacle (there will be a picnic if nothing prevents)
preventability.noun
preventable.adjective
preventer.noun
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