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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)

dielectric heating
nounC1
/ˌdaɪ.ɪˈlɛk.trɪk ˈhiː.tɪŋ/A method of heating non-conductive materials using a high-frequency electromagnetic field, where heat is generated within the material itself due to molecular friction.
dielectric lens
nounC1
/ˌdaɪ.ɪˈlek.trɪk lenz/A lens made from dielectric material (non-conductive substance) that focuses or directs electromagnetic waves (e.g., radio waves, microwaves) by using spatial variations in its structure rather than refraction through curved surfaces like an optical lens.
dielectric loss
nounVery Low
/ˌdaɪ.ɪˈlɛk.trɪk lɒs/A physical property of a dielectric material: the loss of energy in the form of heat when an alternating electric field is applied to it.
dielectric strength
nounC2
/ˌdaɪ.ɪˈlɛk.trɪk strɛŋkθ/The maximum electric field a material can withstand without breaking down and becoming conductive.
diels
nounVery Low
/diːlz/Proper noun referring to the chemist Otto Diels, co-discoverer of the Diels–Alder reaction in organic chemistry.
diels-alder reaction
nounLow
/ˈdiːlz ˈɔːldə riˈækʃən/A chemical reaction in which a conjugated diene reacts with a substituted alkene (called a dienophile) to form a substituted cyclohexene system.
dien bien phu
nounLow
/ˌdjɛn ˌbjɛn ˈfuː/A decisive military battle in 1954 where Vietnamese forces defeated French colonial troops, marking the end of French Indochina.
diencephalon
nounC2
/ˌdʌɪɛnˈsɛfəlɒn/The posterior part of the forebrain, connecting the midbrain with the cerebral hemispheres, and containing structures such as the thalamus, hypothalamus, epithalamus, and subthalamus.
diene
combining-formnounC2
/ˈdʌɪiːn/An unsaturated hydrocarbon containing two carbon–carbon double bonds.
dieppe
nounVery Low
/diːˈɛp/A port city in northern France, on the English Channel coast of Normandy.
dieresis
nounLow
/daɪˈɛrɪsɪs/The mark ¨ placed over a vowel to indicate it is pronounced separately from the preceding vowel, as in naïve.
dies
nounHigh (as verb form), Low (as plural noun in everyday contexts)
/daɪz/Third person singular present of 'die': stops living; ceases to exist. Also plural of 'die': small cubes for games or a tool for shaping materials.
dies committee
nounB2
/kəˈmɪti/A group of people appointed for a specific function, typically consisting of members of a larger group, to discuss, manage, or make decisions on particular matters.
dies irae
nounLow frequency (primarily in liturgical, classical music, and literary contexts).
/ˌdiːeɪz ˈɪəraɪ/A Latin phrase meaning 'Day of Wrath', traditionally referring to the day of God's final judgment of souls.
dies non
nounExtremely low (archaic/technical)
/ˌdiːeɪz ˈnɒn/A day on which no legal or official business is conducted; a non-business day.
diesel
adjectivenounB1
/ˈdiːz(ə)l/A type of heavy oil used as fuel in engines, especially in vehicles and generators.
diesel cycle
nounC1/C2 (Technical Vocabulary)
/ˈdiːzl̩ ˌsaɪkl̩/A specific thermodynamic cycle that models the operation of diesel engines, involving adiabatic compression, constant pressure heat addition, adiabatic expansion, and constant volume heat rejection.
diesel engine
nounB2
/ˈdiːzl̩ ˌen.dʒɪn/An internal combustion engine in which the fuel is ignited by the high temperature of compressed air, rather than by a spark plug.
diesel fuel
nounCommon
/ˈdiːzəl ˈfjuːəl/A liquid fuel derived from petroleum, designed for use in diesel engines where ignition is achieved through compression rather than a spark.
diesel oil
nounB2
/ˈdiːz(ə)l ɔɪl/A heavy petroleum fraction used as fuel in diesel engines.

Showing 3221–3240 of 7181 words.