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English Words Starting With H

5,990 entries — pick a word to see its definition, pronunciation, and usage.

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

hematin
nounC2+ (Very low frequency, specialist vocabulary)
/ˈhiːmətɪn/A dark brown, iron-containing compound that is the non-protein component of hemoglobin and other heme proteins.
hematinic
adjectivenounC2
/ˌhiːməˈtɪnɪk/A substance that stimulates the production of red blood cells or increases the amount of hemoglobin in the blood.
hematite
nounC2
/ˈhiː.mə.taɪt/A common, naturally occurring mineral form of iron oxide (Fe₂O₃), typically grey or black in colour, and an important iron ore.
hematoblast
nounVery Low
/ˈhiːmətə(ʊ)ˌblɑːst/A precursor cell in the bone marrow that develops into a blood cell; an immature cell that gives rise to the various formed elements of blood.
hematocele
nounVery Low
/ˈhiːmətə(ʊ)ˌsiːl/A medical condition involving a localised collection of blood, usually clotted, in a body cavity or space, particularly the tunica vaginalis of the testis.
hematochezia
nounLow (Technical/Medical)
/ˌhiːmətə(ʊ)ˈkiːzɪə/The medical term for the passage of fresh, red blood in the stool.
hematocrit
nounC1/C2
/ˈhiː.mə.tə(ʊ).krɪt/The proportion of red blood cells in the blood, expressed as a percentage; also the laboratory test or apparatus used to measure this proportion.
hematocyst
nounVery low
/ˈhiː.mə.təʊ.sɪst/A cyst or sac containing blood.
hematocyte
nounLow
/ˈhiːmətə(ʊ)ˌsʌɪt/A blood cell.
hematogenesis
nounRare / Technical
/ˌhiː.mə.təʊˈdʒen.ə.sɪs/the formation and development of blood cells.
hematology
nounC2
/ˌhiː.məˈtɒl.ə.dʒi/The branch of medicine that studies blood, blood-forming organs, and blood diseases.
hematolysis
nounC2
/ˌhiː.məˈtɒl.ɪ.sɪs/The destruction of red blood cells, causing the release of hemoglobin.
hematoma
nounC2
/ˌhiːməˈtəʊmə/A solid swelling of clotted blood within the body's tissues, typically caused by a break in a blood vessel.
hematophyte
nounVery Rare / Obsolete Technical
/ˈhiːmətə(ʊ)ˌfaɪt/A plant parasite that lives within the blood vessels of an animal host.
hematopoiesis
nounC2 / Highly Specialized
/ˌhiː.mə.tə(ʊ).pɔɪˈiː.sɪs/The physiological process of forming new blood cells in the bone marrow.
hematoporphyria
nounVery Low
/ˌhiːmətəʊpɔːˈfɪrɪə/A medical condition characterized by the abnormal presence of hematoporphyrin in the blood, often associated with certain types of porphyria.
hematosis
nounVery Low / Technical
/ˌhiːməˈtəʊsɪs/The process of blood oxygenation in the lungs.
hematoxylin
nounC2
/ˌhiːməˈtɒksɪlɪn/A natural dye extracted from logwood, used primarily as a nuclear stain in histology and pathology.
hematozoon
nounVery Low
/ˌhiːmətəʊˈzəʊɒn/A protozoan parasite that lives within the blood or blood cells of a host.
hematuria
nounVery Low
/ˌhiːməˈtjʊəriə/The presence of blood in urine.

Showing 2281–2300 of 5990 words.