perspicuous
Clearly expressed, easy to understand; lucid.
(Of a language or notation) the process of inference from premises to conclusion is explicitly laid out.
That can be seen through clearly; that lets light through.

perspirable
Capable of being perspired.
Emitting perspiration; perspiring.

perspirative
Performing the act of perspiration or sweating; perspiratory.

perspiratory
Of or pertaining to perspiration.

perspiry
sweaty

persuadable
Able to be persuaded (convinced).

persuadables
plural of persuadable

persuasible
persuadable

persuasive
Able to persuade; convincing.

persuasives
plural of persuasive

persuasory
Persuasive.

persubstituted
substituted at all available positions

persulfidated
reacted with a persulfide; subjected to persulfidation

persulfidic
Relating to or composed of persulfides.

persulfurated
Modified by the addition of persulfide bonds

persulfuric
Of or pertaining to persulfuric acid

persulphocyanic
Only used in persulphocyanic acid

persymmetric
Such that the values on each line perpendicular to the main diagonal are the same for a given line.
Symmetrical about the anti-diagonal.

persymmetrical
Alternative form of persymmetric.

pertechnetic
Relating to pertechnetic acid or its derivatives

perthitic
Of, pertaining to, or resembling perthite

pertinaceous
Alternative form of pertinacious.

pertinacious
Holding tenaciously to an opinion or purpose.
Stubbornly resolute or tenacious.

pertinant
Misspelling of pertinent.

pertinent
A right that attaches to land, in Scots law.

pertinents
plural of pertinent

pertingent
Touching; having direct contact with.

pertish
Somewhat pert.

pertransient
Passing through; transient.

pertrochanteric
Passing through the (greater) trochanter

perturbable
That can be perturbed

perturbated
simple past and past participle of perturbate

perturbational
Of, pertaining to, or caused by perturbation.

perturbative
Of, pertaining to, or causing perturbation

perturbatory
Relating to, or causing, perturbation.

perturbed
simple past and past participle of perturb

pertusariaceous
Of or relating to the Pertusariaceae.

pertusate
Pierced (at the apex); perforated.

pertuse
pierced or punched with holes

pertused
pertuse; pierced with holes

pertussal
Pertaining to pertussis or whooping-cough.

pertussoid
Characteristic of whooping cough

peruked
Wearing a peruke.

perular
Of or relating to perulae.

perulate
Bearing perulae.

peruqued
Alternative form of peruked.

perusable
Capable of being perused.

pervaginal
By way of the vagina

pervalicious
Perverted in a delicious or appealing way.

pervalvar
perpendicular to the centre of the valve face of a diatom

pervasive
Manifested throughout; pervading, permeating, penetrating or affecting everything.

perversive
Tending to pervert.

pervertable
Alternative form of pervertible.

pervertables
plural of pervertable

pervertible
Capable of being perverted.

perverty
Synonym of perverted.

pervicacious
Extremely stubborn or headstrong; wilful, obstinate.

pervier
comparative form of pervy: more pervy

perviest
superlative form of pervy: most pervy

pervy
Behaving or looking like a sexual pervert.

perxenic
Relating to perxenic acid or its derivatives.

pesadich
Permissible to eat on Passover.

pesante
heavy, ponderous

pescatorio
Synonym of piscatory ring.

peskier
comparative form of pesky: more pesky

peskiest
superlative form of pesky: most pesky

pesky
Annoying, troublesome, irritating (usually of an animal or child).

pestaloid
Synonym of pestalotioid.

pestalotioid
Similar to those of species in the genus Pestalotiopsis.

pestersome
Characterised or marked by pestering; bothersome; annoying

pestery
Tending to pester.

pestful
annoying; acting as a pest

pesticidal
Of, pertaining to, or effective as a pesticide.

pestiferous
containing organisms that cause contagious diseases
annoying, vexatious

pestiviral
Relating to pestiviruses

pestlike
Resembling or characteristic of a pest.

pestoed
Prepared with pesto.

pestolike
Resembling or characteristic of pesto.

pestological
Relating to pestology.

pestproof
Resistant to pests.

pesty
annoying or troublesome; pesky

petaled
Having or with petals.

petaliferous
Bearing petals.

petaliform
Having the form of a petal.

petaline
petalous (pertaining to, attached to, or resembling a petal)

petalled
Having petals.

petalless
Lacking petals.

petallike
Resembling or characteristic of a petal.

petalline
Alternative form of petaline.

petalloid
Alternative form of petaloid.

petalloids
plural of petalloid

petally
Resembling or characteristic of a petal.

petaloid
Resembling the petal of a flower.

petaloidal
Synonym of petaloid.

petaloids
plural of petaloid

petalous
Having petals.

petalsome
Full of petals.

petascale
A metric for objects on the scale of quadrillions (10¹⁵ or 1,000,000,000,000,000) of elements. Most often used for computer systems; a petascale computer system operates at speeds measured in petaflops and has memory measured in petabytes.

petaurine
Relating to the possum family Petauridae.

petaurines
plural of petaurine

petchem
Abbreviation of petrochemical.

petchems
plural of petchem

petecchial
Misspelling of petechial.

petechiate
Alternative form of petechiated.

petechiated
Marked with petechiae.

petechioid
Resembling a petechia.

petillant
Alternative form of pétillant.

petiolaceous
Relating to the petiole.

petiolar
Of or pertaining to a petiole.

petiolary
Dated form of petiolar.

petiolate
petiolated (connected to a stem by means of a petiole)

petiolated
Having a petiole

petiolates
plural of petiolate

petioled
Having a petiole.
Growing on a petiole.

petiolular
Of or relating to a petiolule.

petiolulate
Supported by its own petiolule

petioluled
Having a petiolule

petitionable
That can be petitioned

petitional
Of or relating to a petition.

petitionary
supplicatory or asking; making a petition
Containing a petition, or having the nature of a petition.

petitive
Indicating desire.

petitory
petitioning, soliciting, begging, petitionary

petless
Without pets (domestic animals).

petlike
Resembling a housepet

petrean
Composed of rock or stone; rocky, stony.

petricolous
Rock-dwelling; living among or on rocks.

petrifactive
Having the quality of converting organic matter into stone; petrifying.
Pertaining to, or characterized by, petrifaction.

petrifiable
Capable of being petrified.

petrific
Petrifying, turning into stone; petrifactive.

petrificant
Causing petrification; turning something to stone.

petrificious
Causing petrification

petrobasilar
petrous and basilar

petrocalcic
Of or relating to a kind of soil horizon formed when secondary calcium carbonates or other carbonates accumulate in the subsoil to the extent that the soil becomes cemented into a hardpan.

petrochem
Clipping of petrochemical.

petrochemical
Any chemical derived from petroleum.
Any chemical derived from any of the fossil fuels: petroleum, natural gas, or coal.

petrochemicals
plural of petrochemical

petrochems
plural of petrochem

petrochronologic
Relating to petrochronology.

petrochronological
Alternative form of petrochronologic.

petroclival
Relating to the petrous part of the temporal bone and the clivus

petrofabric
Of or pertaining to petrofabrics.

petrogenic
Of or pertaining to the formation of rock.

petrogeological
Pertaining to petrogeology.

petroglyphic
Of or pertaining to petroglyphs.

petrographic
Relating to petrographs.
Relating to petrography.

petrographical
Alternative form of petrographic.

petrogypsic
cemented together by gypsum

petrohyoid
Pertaining to the petrous, or periotic, portion of the skull and the hyoid arch.

petrohyoids
plural of petrohyoid

petroicid
Of or relating to the passerine family Petroicidae.

petroicids
plural of petroicid

petrolelectric
Alternative spelling of petrol-electric.

petroleous
Containing petroleum.
Pertaining to the mining of petroleum.
Characteristic of oil or petroleum.

petrolic
Of or pertaining to petroleum