From Wiktionary, the free dictionary
rain cloud (plural rain clouds )
A cloud from which rain is falling or may fall.
1936 , F.J. Thwaites , chapter XXII, in The Redemption , Sydney: H. John Edwards, published 1940 , page 214 :Between the grey mist of rainclouds the sun suddenly appeared to mottle the wet asphalt of Marble Arch in patches of silver and ebony.
1947 January and February, O. S. Nock, “"The Aberdonian" in Wartime”, in Railway Magazine , page 7:During this fine run through Fife the weather had deteriorated rapidly, and as we passed Wormit and came onto the Tay Bridge heavy rain clouds were piled over the sea.
cloud from which rain is falling
Belarusian: дажджавая хмара ( daždžavaja xmara )
Burmese: မိုးတိမ်တိုက် (my) ( mui:timtuik ) , မိုးသား (my) ( mui:sa: )
Catalan: nimbus (ca) m , núvol plugisser m
Chinese:
Mandarin: 雨雲 / 雨云 (zh) ( yǔyún )
Dutch: regenwolk (nl) f , nimbuswolk f
Dzongkha: ཆར་སྤྲིན ( char sprin )
Esperanto: pluvnubo
Finnish: sadepilvi
French: nimbus (fr)
Georgian: საწვიმარი ღრუბელი ( sac̣vimari ɣrubeli )
German: Regenwolke (de) f , Nimbus (de) , Schleierwolke f
Hungarian: esőfelhő (hu) , nimbusz (hu) , nimbuszfelhő
Icelandic: regnský (is) n , úrkomuský n , regnþykkni (is) n
Ilocano: kuyemyem
Ingrian: tuuca
Irish: scamall báistí m
Istriot: nenbo m
Italian: nuvola (it) f , nube (it) f , nembo (it) m
Japanese: 雨雲 (ja) ( あまぐも , amagumo)
Korean: 비구름 (ko) ( bigureum )
Latin: nimbus (la) m
Lubuagan Kalinga: libuu , bulot
Luxembourgish: Reewollek f
Macedonian: дождовен облак m ( doždoven oblak )
Maori: okewa
North Frisian: ( Föhr-Amrum ) swark n
Norwegian:
Bokmål: regnsky m or f
Nynorsk: regnsky f
Persian: مزنه ( mozne )
Pitjantjatjara: ngangkaḻi
Portuguese: nimbo (pt)
Russian: дождевая ту́ча ( doždevaja túča ) , дождево́е о́блако n ( doždevóje óblako )
Sorbian:
Lower Sorbian: mrokawa m , mrok m
Spanish: nimbo (es) m
Swedish: regnmoln (sv) n
Tagalog: dagim
Tibetan: ཆར་སྤྲིན ( char sprin )
Turkish: yağmur bulutu (tr)
Venetan: nenbo m
Vietnamese: mây mưa (vi)
Volapük: reinalefog