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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)

diphenamid
nounExtremely Low (Specialist Technical Term)
/daɪˈfɛnəmɪd/A chemical compound used as a selective herbicide, primarily to control grasses and broadleaf weeds in various crops.
diphenhydramine
nounC2
/ˌdʌɪfɛnˈhʌɪdrəmiːn/A synthetic antihistamine drug used to treat allergy symptoms and as a sleep aid.
diphenoxylate
nounC2
/ˌdaɪfɛˈnɒksɪleɪt/A synthetic opioid medication used to treat acute diarrhea and dysentery by slowing intestinal motility.
diphenyl
nounLow
/daɪˈfiːnaɪl/A chemical compound consisting of two phenyl groups connected by a single bond; also known as biphenyl.
diphenyl ketone
nounRare
/daɪˌfɛnəl ˈkiːtəʊn/An organic compound with the chemical formula (C6H5)2CO, consisting of two phenyl groups attached to a carbonyl group.
diphenylacetylene
nounVery Low
/daɪˌfɛnɪləˈsɛtɪliːn/A chemical compound consisting of two phenyl groups attached to an acetylene (triple-bonded carbon) unit.
diphenylamine
nounVery Rare
/daɪˌfɛnɪləˈmiːn/An organic compound consisting of two phenyl groups attached to an amine group, used primarily as a stabilizer and antioxidant.
diphenylaminechlorarsine
nounVery Low
/daɪˌfɛnɪləˌmiːnˌklɔːrˈɑːsiːn/A toxic arsenic-based chemical compound, specifically an organoarsenic vesicant and sternutatory agent.
diphenylhydantoin
nounVery Low
/ˌdʌɪfɛnʌɪlˈhʌɪdəntəʊɪn/A synthetic anticonvulsant drug, primarily used to treat epilepsy and cardiac arrhythmias.
diphenylhydantoin sodium
nounVery Low
/daɪˌfɛnɪlhaɪˈdæntəʊɪn ˈsəʊdiəm/A pharmaceutical salt form of phenytoin, used as an anticonvulsant medication to control seizures.
diphonia
nounVery Low (Technical)
/dʌɪˈfəʊnɪə/A pathological condition of the voice characterized by the simultaneous production of two distinct pitches.
diphosgene
nounVery Low
/daɪˈfɒsdʒiːn/A poisonous liquid chemical compound, trichloromethyl chloroformate (CCl₃OCOCl), used as a chemical weapon.
diphosphate
nounC2
/daɪˈfɒsfeɪt/A compound containing two phosphate groups, often a salt or ester of diphosphoric acid.
diphosphoglycerate
nounC2
/ˌdʌɪˌfɒsfəʊˈɡlɪsəreɪt/A phosphorylated derivative of glycerate, specifically 2,3-diphosphoglycerate, which plays a crucial role in regulating the oxygen-binding affinity of hemoglobin in red blood cells.
diphtheria
nounlow
/dɪfˈθɪəriə/A serious bacterial infection affecting the mucous membranes of the throat and nose.
diphtheroid
adjectivenounVery Low
/ˈdɪfθərɔɪd/Bacteria resembling Corynebacterium diphtheriae (the causative agent of diphtheria), but typically not producing the potent diphtheria toxin.
diphthong
nounverb-ambitransitiveLow frequency (C1+)
/ˈdɪfθɒŋ/A single vowel sound that glides from one quality to another within a single syllable.
diphthongia
nounExtremely Rare / Obsolete
/dɪfˈθɒŋɡɪə/An obsolete or extremely rare term historically used to refer to the nature or state of being a diphthong.
diphthongize
verbverb-intransitiveverb-transitiveC2
/ˈdɪfθɒŋɡaɪz/ or /ˈdɪpθɒŋɡaɪz/to change a simple vowel sound into a diphthong (a complex vowel sound gliding from one quality to another within a single syllable)
diplacusis
nounVery Low
/ˌdɪpləˈkjuːsɪs/A medical condition where a single sound is perceived as two separate pitches or tones in one or both ears.

Showing 3661–3680 of 7181 words.