Erayada ka bilowda xarafka D ee Walax-ogaalka (physics)
- Dalton’s law of partial pressure: Xeerka Dhaalton ee cadaadis-qaybeedka
- Damping: Liciifis/Dhimid
- Damping of Mechanical system: Liciifis habdhis makaanikeed
- Daniel Cell: Unug Dhaaniyel
- Data: Jibayto
- Dating: Da’ayn
- Decay: Mataatax
- Decay constant: Madoorsoome mataatax
- Decay products: Maxsuulyo mataatax
- Decay, radioactive: Kaahfal mataatax
- Decibel (unit): Desibel (halbeeg)
- Declination: Janjeedh/hoos-udeg
- Decomposition: Kala-bax
- Decoupling: Sidig-tirid
- Defect: Iin
- Deflection: Leexad
- Deformation: Qaabdoorsan
- Deformation, elastic: Qaabdoorsan loodsame
- Deformation, inelastic: Qaabdoorsan maloodsame
- Degree: Digrii
- Demagnetisation: Birlabnimotir
- Demodulation: Tacdiiltir
- Density: Cufnaan
- Density, relative: Cufnaan u-eegan
- Detector: Dareeme
- Desalination: Cusbotir
- Deviation angle: Xagal weecad
- Dew point: Bar dharab
- Diamagnetism: Ka-siq-birlabeed
- Dielectric: Laba-danab
- Dielectric constant: Madoorsoome laba-danab
- Dielectric field: Badad labadanab
- Dielectric leakage: Liigid labadanab
- Dielectric strength: Quwad labadanab
- Diesel Engine: Injiin Dhiisal
- Diffraction: Gadaal-baah
- Diffraction gratings: Shuqudyo gadaalbaah
- Diffraction of Light: Gadaalbaah Ilays
- Diffraction of Sound: Gadaalbaah Jabaq
- Diffraction spectrum: Jeegaan gadaalbaah
- Diffusion: Dhexgal
- Diffusion Chamber: Qolka Dhexgalka
- Dimension: Aadimo
- Dilation: Isbeddel Mugeed
- Diode: Labaqotinle
- Diode voltage: Fooltejka laba-qotinle
- Dipole: Labacidhifle
- Dipole, electric: Labacidhifle danabeed
- Dipole, magnetic: Labacidhifle birlabeed
- Dipole, moment: Maroojis labacidhifeed
- Dip: Foorar
- Dip circle: Foorar goobo
- Direct Current (DC): Qulqul Toosan (QT)
- Discharge: Danabtir
- Discharge coefficient: Weheliye danabtir
- Discharge tube: Dhuun danabtir
- Disintegration: Burbur
- Disintegration, Nuclear: Burbur Bu’eed
- Dispersion: Kalaxayad
- Dispersion of light: Kalaxayad ilays
- Dispersive power: Awood kalaxayad
- Displacement: Barabax
- Displacement current: Qulqul barabax
- Dissociation: Kalafur
- Dissociation Energy: Tamar Kalafur
- Distillation: Xareedayn
- Distillation, Fractional: Qayb-xareedayn
- Distortion: Qaablun
- Distribution: Filiqsanaan
- Divergence: Firidhsanaan
- Divergent rays: Fallaadho firidhsan
- Donor: Deeqe
- Doppler Effect: Raadka Doblar
- Drift velocity: Kaynaan kaladurug
- Dust core: Dhuux Awaare
- Dynamics: Daynaamikada
- Dynamo: Daynamo
- Dyne (unit): Dhayn (halbeeg)