heeler
A gamecock that strikes well with its heels or spurs.
A quick runner.
A dog that readily comes to heel.
A dog used for cattle droving.
A dependent and subservient hanger-on of a political patron.
The rodeo performer who ropes the steer by its hind feet after the header has turned it.
A student journalist at Yale University.

heelers
plural of heeler

heightmap
A two-dimensional raster image used to store surface elevations that can later be applied to a three-dimensional object.

heightmaps
plural of heightmap

heisenbug
A software bug which fails to manifest itself or manifests differently during debugging.

heisenbugs
plural of heisenbug

helicograph
An instrument for drawing spiral lines on a plane.

helicographs
plural of helicograph

heliochromoscope
A device for combining three specially taken black-and-white photographs so as to produce a color image.

heliochromoscopes
plural of heliochromoscope

heliograph
An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
A heliogram.
An instrument for measuring the intensity of sunlight.
A device for photographing the sun.
A photograph.

heliographs
plural of heliograph

helioscope
An apparatus for viewing the Sun without harming the eye, by means of an optical filter that attenuates most of the sunlight while allowing only a small amount of the solar radiation.

helioscopes
plural of helioscope

heliospectrograph
A spectrograph for use on the Sun

heliostat
A device that includes a plane mirror which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction in space, and is almost always stationary relative to the heliostat, so the light is reflected in a fixed direction.

heliostats
plural of heliostat

heliothermometer
Synonym of actinometer.

heliothid
A moth of what used to be considered the family Heliothidae, but is now the considered the subfamily Heliothinae within the family Noctuidae.

heliothids
plural of heliothid

heliotron
A stellarator in which a helical coil is used to confine the plasma, together with a pair of poloidal field coils to provide a vertical field.

heliotrons
plural of heliotron

helitorch
An ignition device operated from a helicopter, used to start controlled fires etc.

helitorches
plural of helitorch.

helminthicide
Any substance used to kill helminths.

helminthicides
plural of helminthicide

helmspersons
plural of helmsperson

helpdesk
Alternative form of help desk.

helpdesks
plural of helpdesk

hemabate
A solution of prostaglandin used to control postpartum bleeding

hemacytomer
Misspelling of hemocytometer.

hemacytometer
Alternative spelling of hemocytometer.

hemacytometers
plural of hemacytometer

hemadromograph
Alternative form of haemadromograph.

hemadromographs
plural of hemadromograph

hemadynamometer
An instrument to take various measurements in the blood, originally only blood pressure.

hemadynamometers
plural of hemadynamometer

hemalum
a mixture of hematoxylin and alum that is used to stain cell nuclei

hemalums
plural of hemalum

hematachometer
Alternative form of haematachometer.

hematachometers
plural of hematachometer

hematocytometer
Synonym of hemocytometer.

hematocytometers
plural of hematocytometer

hematodialysis
Alternative form of hemodialysis.

hematoscope
Alternative form of haemoscope.

hematoscopes
plural of hematoscope

hematotympanum
hemotympanum

hemidome
Synonym of semidome.

hemidomes
plural of hemidome

hemihomonym
A scientific name of an organism that is also used for a different taxon in a different kingdom subject to a different code of nomenclature.

hemihomonyms
plural of hemihomonym

hemiscreen
Either half of a screen that has been divided into two

hemiscreens
plural of hemiscreen

hemmer
One who, or that which, hems.
A device, attached to a sewing machine, that turns over the edge of a fabric before stitching it down.
A tool for turning over the edge of sheet metal to make a hem.

hemmers
plural of hemmer

hemoadsorber
A device used in hemoadsorption

hemoadsorbers
plural of hemoadsorber

hemochromocytometer
An instrument used in hemochromocytometry

hemochromocytometers
plural of hemochromocytometer

hemoclip
A small metal clip used to prevent bleeding.

hemoclips
plural of hemoclip

hemocomponent
A component of (donated) blood

hemocomponents
plural of hemocomponent

hemocuvette
A cuvette used to hold a blood sample

hemocuvettes
plural of hemocuvette

hemocytomer
Misspelling of hemocytometer.

hemocytometer
A device used to count the number of blood cells in a volume of blood.

hemocytometers
plural of hemocytometer

hemodialyses
plural of hemodialysis

hemodialysis
Dialysis that uses an extracorporeal apparatus to remove waste products from the blood in the case of kidney failure.

hemofilter
The apparatus used in hemofiltration

hemofilters
plural of hemofilter

hemoglobinometer
Alternative form of haemoglobinometer.

hemoglobinometers
plural of hemoglobinometer

hemoscope
Alternative form of haemoscope.

hemoscopes
plural of hemoscope

hemostat
An instrument that clamps blood vessels to diminish or halt blood flow.

hemostats
plural of hemostat

hemoximeter
The measuring device used in hemoximetry.

hemoximeters
plural of hemoximeter

hendiadys
A figure of speech used for emphasis, where two words joined by and are used to express a single complex idea.

hendiadyses
plural of hendiadys

hendiatris
A figure of speech or literary device in which three words are used to express one idea.

hepatojugularometer
A device used to establish quantitative control and to measure the pressure and force applied over the liver to test the hepatojugular reflux.

hepatojugularometers
plural of hepatojugularometer

herapathite
Iodoquinine sulfate, a chemical compound whose crystals are dichroic and thus can be used for polarizing light.

herapathites
plural of herapathite

herbicide
A substance used to kill plants.

herbicides
plural of herbicide

herdspersons
plural of herdsperson

herisson
A beam or bar armed with iron spikes, and turning on a pivot, used to block up a passage.
A hedgehog.

herissons
plural of herisson

herl
a strand of hair
the fibrous shaft or barb of a feather (especially that of the ostrich or peacock) used to make artificial flies for angling
an artificial fly made with this barb

herls
plural of herl

hersillon
A beam with projecting spikes, used to make a breach impassable.

hersillons
plural of hersillon

hessian
A strong, coarse fabric made from hemp or jute, often used for making sacks.

hessians
plural of hessian

hetchel
Alternative form of hatchel.

hetchels
plural of hetchel

heteranthrene
Any heterocycle consisting of two benzene rings fused to a 1,4-diheterabenzene in which the heteroatoms are the same e.g. thianthrene

heteranthrenes
plural of heteranthrene

heteroaggregate
An aggregate of two or more different materials

heteroaggregates
plural of heteroaggregate

heterochaperone
A heterodimer formed from two chaperones

heterofermenter
A fermenter used for heterofermentation

heterofermenters
plural of heterofermenter

heterogloss
Synonym of isogloss.

heterolayer
Any of a series of thin layers of different materials in a semiconductor (or similar) device

heterolayers
plural of heterolayer

heteroptics
hallucination; the vision of something that is not real.

hex
To cast a spell on (specifically an evil spell), to bewitch.

hexabenzobenzene
Synonym of coronene.

hexabenzobenzenes
plural of hexabenzobenzene

hexabenzocoronene
A polycyclic aromatic hydrocarbon in which six benzene rings are fused to the six available positions of a coronene ring
A polycyclic aromatic hydrocarbon in which six benzene rings are fused to the six available positions of a coronene ring

hexachlorofluorescein
A chlorinated derivative of fluorescein that is used to label oligonucleotides.