haptoglobin
A protein in blood plasma that binds free hemoglobin released from erythrocytes and thereby inhibits its oxidative activity.

haptoglobins
plural of haptoglobin

haptoglobulin
Synonym of haptoglobin.

haptoglobulins
plural of haptoglobulin

haptomonad
Synonym of haptophyte.
An attached form of some promastigotes

haptomonads
plural of haptomonad

haptophore
The stable, non-poisonous element of a toxin that enables it to bind to an antitoxin and become neutralized.

haptophores
plural of haptophore

haptophycean
Synonym of haptophyte.

haptophyceans
plural of haptophycean

haptophyte
A kind of unicellular marine phytoplankton, typically covered in tiny scales or plates composed of carbohydrates and calcium deposits

haptophytes
plural of haptophyte

hardcoat
A coating that provides a hard, protective layer.

hardcoats
plural of hardcoat

hardcourt
A tennis court having a hard surface, frequently concrete

hardcourts
plural of hardcourt

hardenite
A structureless mixture of martensite and austenite.

hardpack
A material (such as dirt, gravel, or snow) compressed into a hard, smooth surface for roads etc.
A hard package, especially of cigarettes.

hardpacks
plural of hardpack

hardstyle
A genre of electronic dance music that combines elements of trance, techno, and hardcore, with origins in the Netherlands and Belgium.
In contrast to sports style, a specifically intensive workout exercise, such as a swing squat.

harmalin
Alternative form of harmaline.

harmaline
The reduced hydrated form of harmine.

harmalines
plural of harmaline

harmalol
An alkaloid, 1-methyl-4,9-dihydro-3H-pyrido[3,4-b]indol-7-ol, found in the seeds of the harmal plant

harmandianamine
A lactonic carbazole found in Clausena harmandiana.

harmandianamines
plural of harmandianamine

harmane
An alkaloid related to harmine.

harmol
A naturally occurring β-carboline.

harpagide
An iridoid found in the fruits of Clerodendrum colebrokianum.

harpin
A protein produced by certain plant pathogens

harpins
plural of harpin

harzialactone
Any of a group of aromatic lactones present in Trichoderma harzianum that have some antitumor and cytotoxic properties

harzialactones
plural of harzialactone

hauntology
A concept involving the return or persistence of elements from the social or cultural past.

havercosine
the trigonometric function (1 + cos(x)) / 2, equal to half the vercosine

havercosines
plural of havercosine

haversine
The haversed sine.

haversines
plural of haversine

hawkbell
A small round metal bell used in falconry, attached to the leg of the bird.

hawkbells
plural of hawkbell

hawsepipe
metal pipe fitted into a hawsehole, to protect the wood

hawsepipes
plural of hawsepipe

hazmat
Hazardous material(s).

hazmats
plural of hazmat

headchopper
A rollercoaster element designed to give the illusion of bringing riders' heads or arms dangerously close to ride structure.

headchoppers
plural of headchopper

headfuckery
Material that destabilizes or confuses the mind.

headgroup
A bulky part of a molecule, often containing one or more functional groups, attached to a relatively long aliphatic tail or backbone
The group of instances at the head (high end) of a distribution curve

headgroups
plural of headgroup

headlease
A lease to a landlord or lessor; commonly from the perspective of a sublease to that lease.

headleases
plural of headlease

headnote
A note at the head of a page, chapter, dictionary entry, or other document element.
A summary of the relevant aspects of a legal case, usually found at the beginning of a case report.

headnotes
plural of headnote

headstall
The part of a bridle that fits over a horse's head and supports other elements.
A phorbeia.

headstalls
plural of headstall

headword
A word (or compound term) used as the title of a list entry or section, particularly in a dictionary, encyclopedia, or thesaurus.
The head of a phrase.

headwords
plural of headword

heartburn
A burning pain in the chest that is caused by stomach acid entering the gullet.
annoyance, heartache, or similar feelings.

heartburns
plural of heartburn

hecdecane
Archaic form of hexadecane.

hecogenin
An organic compound obtained from the sisal plant and used in the production of steroidal drugs.

hecogenins
plural of hecogenin

hedgeline
The path or track of a hedge through a landscape.

hedgelines
plural of hedgeline

heerabolene
A sesquiterpene derived from a heerabol myrrh.

hefutoxin
A neurotoxin in the venom created by the Asian black forest scorpion.

hefutoxins
plural of hefutoxin

hegumene
A female hegumen.

heilsgeschichte
Alternative form of Heilsgeschichte.

helenalin
A highly toxic sesquiterpene lactone found in Arnica montana and Arnica chamissonis subsp. foliosa.

heliair
A mixture of helium, nitrogen and oxygen, used as a breathing gas instead of normal air.

helicase
An enzyme required for DNA unwinding.

helicases
plural of helicase

helicate
Any of various polymeric compounds that have a helical structure

helicates
plural of helicate

helicene
Any polycyclic aromatic or heteroaromatic compound, consisting of at least five ortho-fused rings arranged to give a helically-shaped chiral molecule.

helicenes
plural of helicene

helicline
A curving or spiral-shaped ramp; (especially) the ramp at the 1939 New York World's Fair Theme Center.

heliclines
plural of helicline

helikite
Synonym of kytoon.

helikites
plural of helikite

helimagnet
Any material that exhibits helimagnetism

helimagnetism
a property of some metals and of some salts of transition elements at low temperature in which the atomic magnetic moments are arranged in a helix

helimagnets
plural of helimagnet

helimerase
An enzyme that functions both as a helicase and a DNA polymerase

helimerases
plural of helimerase

heliobacteria
plural of heliobacterium

heliobacterium
Any of the Heliobacteriaceae, a family of photoheterotrophic bacteria, using bacteriochlorophyll to convert light energy into chemical energy, exclusively in anaerobic conditions

heliochemistry
The study of the chemical elements present in the Sun.

heliocide
Any of a group of sesterterpenoid insecticides present in cotton (Gossypium hirsutum)

heliocides
plural of heliocide

helions
plural of helion

heliotropin
piperonal

heliox
A mixture of helium and oxygen used as a breathing gas.

helipyrone
The dimeric lactone 6-ethyl-3-[(6-ethyl-4-hydroxy-5-methyl-2-oxopyran-3-yl)methyl]-4-hydroxy-5-methylpyran-2-one present in several herbs and spices

helislab
A relatively large cluster of liquid crystal molecules having a common helical axis.

helislabs
plural of helislab

helixase
Misspelling of helicase.

hellbox
A receptacle where cast metal sorts were thrown after printing.
A blasting machine producing an electrical charge for a detonation.

hellboxes
plural of hellbox

hellbrew
A horrible liquid mixture.
A hellish mess.

hellbrews
plural of hellbrew

helminthosporin
The anthraquinone 1,5,8-trihydroxy-3-methylanthraquinone present in Rumex abyssinicus

helpline
A telephone service (or (by extension) one using email, SMS, or the Web) which offers help to those who call, as either a public emergency service or customer service.

helplines
plural of helpline

helvetane
A certain isomer of [12]prismane, shaped like a plus sign.

helvetanes
plural of helvetane

helveticin
Any of a particular class of bacteriocins

helveticins
plural of helveticin

helvetium
Proposed name for the chemical element astatine.

hemacidin
Any of a group of antimicrobial peptides related to hemoglobin

hemacidins
plural of hemacidin

hemacyanin
Alternative spelling of hemocyanin.

hemagogue
A substance that promotes the flow of blood.

hemagogues
plural of hemagogue

hemapophyses
plural of hemapophysis

hemapophysis
The second element in each half of a hemal arch, corresponding to the sternal part of a rib.

hematein
An oxidized derivative of haematoxylin, used in staining.

hemateins
plural of hematein

hematidrosis
Alternative form of haematidrosis.