Focloir d

From South Dublin Astronomical Society

dark matter damhna m4 dorcha

dark nebula réaltnéal m1 dorcha
Dawes limit teorainn f5 Dawes
day s lá m (gs lae)

daylight-saving time am m3 coigilte sholas an lae
daytime s am m3 lae
débris s smionagar m1

deceleration s luasmhoilliú m (gs -ithe)
declination s diallas m1

declination axis ais f2 (an) diallais
declination circle ciorcal m1 (an) diallais
declination compass (= declinometer) compás m1 diallais

declinometer s (= declination compass) méadar m1 diallais
defect s fabht m4 (pl-anna)

deferent s ciorcal m1 iompair
deflection s sraonadh m (gs -nta)

degenerate matter damhna m4 díchineálach
degenerate star réalta f4 dhíchineálach
degree s céim f2 (pl-eanna)

degree of arc céim f2 stua
Deimos s (Sat.) Deimos m4
Delphinus s (= the Dolphin) (Const.) Delphinus m4

Delta Cephei (Star) Delta Cephei
Demon Star, the (= Algol, the Winking Demon) an Deamhanréalta f4
Deneb s (Star) Deneb m4

Denebola s (Star) Denebola m4
density s dlús m1
density waves tonnta fpl dlúis

depression s ísleán m1
descending node nód m1 íslitheach
desert regions of Mars réigiúin mpl fásaigh Mharsa

detector s brathadóir m3
deuterium s deoitéiriam m4
deuteron s deoitéarón m1

dew cap drúchtchaidhp f2
diameter s trastomhas m1
diaphragm s spiara m4

dichotomy s déscaradh m (gs -rtha)
differential s difreálach m1

differential a difreálach
diffraction s díraonadh m (gs -nta), díraonachán m1

diffraction grating gríl f2 díraonta
diffraction pattern patrún m1 díraonacháin
diffraction rays gathanna mpl díraonta

diffraction spectrograph speictreagraf m1 díraonacháin
diffuse nebula réaltnéal m1 idirleata
diffuse reflection frithchaitheamh m1 réscaipthe

diffusion s (of light) réscaipeadh m (gs -pthe)
diffusion s (of particles) idirleathadh m (gs

-eata)
dim dwarf abhac m1 lag
Dione s (Sat.) Dione f4

diopter s (= dioptre) dia-optar m1
dioptre s (= diopter) dia-optar m1

Diphda s (Star) Diphda m4
dip of the horizon claonas m1 na léaslíne
dipole aerial (= dipole antenna) aeróg f2 dhépholach

dipole antenna (= dipole aerial) aeróg f2 dhépholach
direct motion dírghluaisne f4
dirty snowball meall m1 sneachta (salach)

dirty snowball model samhail f3 an mhill sneachta
disc s diosca m4
discontinuous spectrum speictream m1 neamhleanúnach

discovery s fionnachtain f3
discrete radio-source radafhoinse f4 scoite
dispersion s spré m4

dispersion measure an tomhas m1 spréite
distance s fad m1
distance finding aimsiú m faid

distance modulus (= modulus of distance) modal m1 faid
distortion s díchumadh m (gs -mtha)

distribution s dáileadh m (gs -lte)
diurnal a laethúil a

diurnal aberration iomrall m1 laethúil
diurnal circle ciorcal m1 laethúil
diurnal libration guagadh m laethúil

diurnal motion gluaisne f4 laethúil
diurnal parallax saobhdhiallas m1 laethúil
diverge v eisréimnigh

divergence s eisréimneacht f3
divergent a eisréimneach
D-layer s D-chiseal m1

Dog Star s (= Sirius) Réalta f4 an Mhadra
Dolphin, the s (= Delphinus) (Const.) an Deilf f2

dome s cruinneachán m1
Donati's comet cóiméad m1 Donati
Doppler broadening leathnú m Doppler

Doppler effect iarmhairt f3 Doppler
Doppler-Fizeau principle prionsabal m1 Doppler-Fizeau
Doppler shift aistriú m Doppler

Dorado s (= the Swordfish) (Const.) an Colgán m1
30 Doradus (= Loop Nebula, Tarantula Nebula) 30 An Cholgáin
double cluster réaltbhraisle f4 dhúbailte

Double Cluster in Perseus, the (= the Sword-Handle) an Réaltbhraisle f4 Dhúbailte i bPeirséas
double galaxy réaltra m4 dúbailte
double star réalta f4 dhúbailte

Dove, the s (= Columba) (Const.) an Colm m1
Draco s (= the Dragon) (Const.) Draco m4

Draconids spl (Met.Sh.) Dracóinidí fpl
draconitic month (= nodical month) mí f dhraganach
Dragon, the s (= Draco) (Const.) an Dragan m1

Draper classification rangú m Draper
Dubhe s (Star) Dubhe m4
Dumb-Bell nebula, the réaltnéal m1 an Tromáin Lúith

Dunsink Observatory Réadlann f2 Dhún Since
dust s deannach m1
dust storm stoirm f2 dheannaigh

dust tail eireaball m1 deannaigh
dust-trail s rian m1 deannaigh
dwarf s (= dwarf star) abhac m1

dwarf Cepheid abhac-Cheifid f2
dwarf galaxy abhacréaltra m4
dwarf nova group grúpa m4 abhacnóvaí

dwarf star (= dwarf) abhacréalta f4
dynamical parallax saobhdhiallas m1 dinimiciúil