Nature

cloud

Source:*obolkъProto-Slavic · “covering (from *ob- + *velkti 'to drag')”certain

Literally 'something dragged over' the sky. Russian took the Church Slavonic form instead of its own pleophonic оболоко.

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English

cloud

Polish

chmura

ˈxmura

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In all five languages

BCS script

Latin under Cyrillic

Russian
о́блакоoblako
ˈobləkəChurch Slavonic
The South Slavic shape -ла- gives it away; the native form оболоко survives only in dialects. Туча is a dark rain cloud.
Ukrainian
хма́раxmara
ˈxmaradifferent word · a North Slavic word of unclear origin (cf. Polish chmura)
Polish
chmura
ˈxmuradifferent word · a North Slavic word of unclear origin (cf. Ukrainian хмара)
Polish obłok, the cognate of облако, is a light, poetic cloud.
Czech
mrak
mrakdifferent word · Proto-Slavic *mrakъ 'darkness'
Czech oblak, the cognate, is a literary word for a cloud.
Bosnian-Croatian-Serbian
oblakоблак
ˈoblakinherited
English
cloud