pentode
A thermionic valve similar to a tetrode with the addition of a third grid, the suppressor grid to reduce the secondary emission effect; was/is used in high quality audio and radio products.

pentodes
plural of pentode

percussor
A small hammer-like tool that a physician uses to provide a light blow to a body part.
A physician who provides light blow to a body part as a diagnostic technique.
A hammerstone or similar tool used for smashing, or chipping.
A part of a device that is intended to impart a striking action.

percussors
plural of percussor

percuteur
A medical instrument for therapeutic or diagnostic percussion.

percuteurs
plural of percuteur

peridiole
A lens-shaped capsule of spores that grows in cups of some kinds of fungi.

peridioles
plural of peridiole

perifulcrum
The protective wall surrounding a pycnidium.

perithece
Synonym of perithecium.

peritheces
plural of perithece

perithecia
plural of perithecium

perithecium
An ascocarp shaped like a skittle or ball, distinguished by a small pore, the ostiole, through which the spores are released one by one when ripe.

peritoneoscope
A narrow medical instrument used in peritoneoscopy.

peritoneoscopes
plural of peritoneoscope

peritrochium
The wheel which, together with the axle, forms the axis in peritrochio.

permathread
A permanent or perennial thread of discussion.

permathreads
plural of permathread

permcath
A permanently inserted catheter.

permcaths
plural of permcath

peronosporale
Any water mold of the order Peronosporales.

peronosporalean
Any water mold of the order Peronosporales

peronosporaleans
plural of peronosporalean

peronosporales
plural of peronosporale

perron
A stone block used as the base of a monument, marker, etc.
A platform outside the raised entrance to a church or large building, or the steps leading to such a platform. US: stoop.

perrons
plural of perron

pesage
A fee or toll paid for the weighing of merchandise.

pesages
plural of pesage

pesane
Alternative form of pisane.

pesanes
plural of pesane

pesen
Obsolete form of pisane.

pesens
plural of pesen

petabytes
plural of petabyte

petapixel
10¹⁵ pixels, as a unit of graphical resolution.

petapixels
plural of petapixel

petiole
The stalk of a leaf, attaching the blade to the stem.
A narrow or constricted segment of the body of an insect; especially, the metasomal segment of certain Hymenoptera, such as wasps.
The stalk at the base of the nest of the paper wasp.

petioles
plural of petiole

petiolule
The petiole of a pinna or pinnule.
A small or partial petiole.

petiolules
plural of petiolule

petiolus
petiole

petroplastic
A plastic produced from petroleum, as opposed to bioplastic.

petroplastics
plural of petroplastic

pettywhin
The needle furze.

pewterware
Articles made from pewter.

pewterwares
plural of pewterware

pfleiderer
A toothed machine for shredding cellulose in the manufacture of synthetic materials.

pfleiderers
plural of pfleiderer

pfund
A pound (unit of weight), in German contexts.

pfunds
plural of pfund

phallosome
A tube of chitin that houses the penis of some insects

phallosomes
plural of phallosome

phantascope
An optical instrument or toy, resembling the phenakistoscope and illustrating the same principle.

phantascopes
plural of phantascope

phantasmascope
Alternative form of phantascope.

phantasmascopes
plural of phantasmascope

phaora
A mattock or large hoe.

phaoras
plural of phaora

phialide
A flask-shaped projection from the vesicle of certain fungi.

phialides
plural of phialide

phonometer
A particular instrument for measuring the force of sounds.

phonometers
plural of phonometer

phonon
The quantum of acoustic or vibrational energy (sound), considered a discrete particle rather than a wave.

phonons
plural of phonon

phonoplex
A railway telegraph system allowing multiple messages to be transmitted at the same time on a single wire.

phonoplexes
plural of phonoplex.

photoangiolysis
angiolysis by means of laser light

photochrom
A colorized image produced from black-and-white photographic negatives via the direct photographic transfer of a negative onto lithographic printing plates.

photochrome
Alternative form of photochrom.

photochromes
plural of photochrome

photochroms
plural of photochrom

photoclinometer
Any of several directional surveying instruments which record photographically the direction and magnitude of well deviations from the vertical.

photoclinometers
plural of photoclinometer

photocolorimeter
A photoelectric colorimeter

photocolorimeters
plural of photocolorimeter

photocrayon
A form of enlarged photographic portrait in which a wet-plate transparency on glass was backed with white paper, on which line work was done with crayon, pencil, and colour.

photocrayons
plural of photocrayon

photoelectrotype
An electrotype plate formed in a mould made by photographing on prepared gelatine, etc.

photoelectrotypes
plural of photoelectrotype

photoenvironment
An environment that has a particular level of light

photoenvironments
plural of photoenvironment

photogelatin
gelatin, coated on a glass plate, that carries an image to be printed by the collotype process

photoglow
A photoglow tube

photoglows
plural of photoglow

photoheliometer
A double-lens instrument for measuring slight variations of the Sun's diameter by photography, based on the common chord of two overlapping images.

photoheliometers
plural of photoheliometer

photolith
photolithography

photolithography
A lithographic procedure in which printing plates are made using a photographic process.
An optical exposure process used in the manufacture of integrated circuits.

photomicrometer
A micrometer used in photomicrometry

photomicrometers
plural of photomicrometer

photopentode
a pentode whose electrical characteristics are light-sensitive

photopentodes
plural of photopentode

photoplate
A photographic plate.

photoplates
plural of photoplate

photoplotter
An electromechanical-optical machine that exposes a latent image on a medium by means of a computer-controlled light source.

photoplotters
plural of photoplotter

photopreference
preference for a particular level or colour of light

photopreferences
plural of photopreference

photoreactor
Any vessel in which a photochemical reaction takes place

photoreactors
plural of photoreactor

photoreflectance
reflectance that varies according to the incident light level

photoreflectances
plural of photoreflectance

photorespirometry
The analysis of respiration as a function of light level

photosetter
A photocomposer; a machine for photosetting.

photosetters
plural of photosetter

photostasis
The balance of energy, in photosynthetic plants, between photochemical input and metabolic output

photosterilization
sterilization, typically of surgical instruments, by exposure to ultraviolet light

phototachymeter
An electrooptical instrument for measuring distances.

phototachymeters
plural of phototachymeter

photozincograph
A print made using photozincography

photozincographs
plural of photozincograph

photozincography
A form of photolithography using a zinc plate

physioball
An exercise ball.

physioballs
plural of physioball

picador
A lancer mounted on horseback who assists a matador.

picadores
plural of picador

picadors
plural of picador

pickoff
A play in which a pitcher throws a live ball to a fielder so that the fielder can tag out a baserunner who has moved away from the base
The rescue of a stranded caver from a rope, returning them to the ground.

pickoffs
plural of pickoff

picnicware
disposable plates, cups, etc. intended for use on picnics

picnicwares
plural of picnicware

picopump
A very small pump that is used with microinjections

picopumps
plural of picopump

picosat
A picosatellite.

picosatellite
An artificial satellite with a wet mass between 0.1 and 1 kilograms.

picosatellites
plural of picosatellite

picosats
plural of picosat

piezoactuator
An actuator activated by mechanical pressure