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English Words Starting With D

7,181 entries — pick a word to see its definition, pronunciation, and usage.

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

dionysius exiguus
nounVery Low
/daɪəˈnɪsɪəs ɛkˈsɪɡjuːəs/A 6th-century Scythian monk and scholar who created the Anno Domini (AD) dating system still used today.
dionysius of alexandria, saint
nounRare / Specialized
/ˌdʌɪ.əˈnɪs.i.əs əv ˌal.ɪɡˈzɑːn.dri.ə seɪnt/A proper noun referring to a specific early Christian saint and theologian.
dionysius of halicarnassus
nounC1+
/ˌdaɪ.əˈnɪs.i.əs əv ˌhæl.ɪ.kɑːˈnæs.əs/A Greek historian and teacher of rhetoric from the 1st century BCE, best known for his major historical work, Roman Antiquities.
dionysius the areopagite
nounLow
/ˌdaɪ.əˈnɪ.sɪ.əs ði ˌær.iˈɒp.ə.ɡaɪt/A biblical figure from the New Testament, converted by the Apostle Paul's sermon in Athens.
dionysius thrax
nounVery low
/daɪ.əˈnɪs.i.əs θræks/A Greek grammarian and scholar of the 2nd century BC, considered the author of the first systematic grammar of the Greek language.
dionysus
nounC1
/ˌdʌɪəˈnʌɪsəs/The ancient Greek god of wine, fertility, ritual madness, ecstasy, and theatre.
dioon
nounVery Low
/daɪˈəʊɒn/A genus of cycad plants native to Mexico and Central America.
diophantine analysis
nounVery low
/ˌdaɪ.əʊˌfæn.taɪn əˈnæl.ə.sɪs/A branch of number theory focused on finding integer solutions to polynomial equations.
diophantine equation
nounC2
/ˌdʌɪə(ʊ)ˈfantɪn ɪˈkweɪʒ(ə)n/A polynomial equation with integer coefficients that is to be solved for integer values.
diophantus
nounLow
/ˌdaɪ.əˈfæn.təs/A proper noun referring to the ancient Greek mathematician from Alexandria, known for his work in algebra and number theory.
diopside
nounC2
/dʌɪˈɒpsʌɪd/A common, typically green to black mineral, composed of calcium magnesium silicate (CaMgSi₂O₆), found in many igneous and metamorphic rocks.
diopsimeter
nounVery Low
/ˌdaɪ.ɒpˈsɪm.ɪ.tər/An instrument for measuring the field of vision of the eye.
dioptase
nounC2
/daɪˈɒpteɪz/A rare, emerald-green to blue-green mineral consisting of a hydrous copper silicate.
diopter
nounC2
/daɪˈɒptə(r)/A unit of measurement of the optical power of a lens or curved mirror, equal to the reciprocal of the focal length in metres.
dioptometer
nounVery Low (Technical)
/ˌdaɪ.ɒpˈtɒm.ɪ.tə/An instrument for measuring the refractive power of the eye, particularly for determining the optical correction needed for glasses or contact lenses.
dioptre
nounC2 / Extremely Rare
/daɪˈɒp.tər/A unit of measurement of the refractive power of a lens, equal to the reciprocal of its focal length in metres.
dioptrics
nounVery Low
/daɪˈɒp.trɪks/The branch of optics that deals with the refraction of light, especially by lenses.
dior
nounC2
/diˈɔː/A prestigious French fashion house founded by Christian Dior.
diorama
nounLow frequency
/ˌdaɪəˈrɑːmə/A three-dimensional model representing a scene with figures and objects, often in a box or case, used for display or education.
diorite
nounLow
/ˈdaɪ.ə.raɪt/A coarse-grained, intrusive igneous rock.

Showing 3621–3640 of 7181 words.