об

• объ (obŭ)

From Proto-Slavic *o(b), from Proto-Indo-European *h₃ebʰi.

об • (ob)

1. on, at
2. through
3. during

• Mali staroslavensko-hrvatski rječnik, Matica hrvatska, Zagreb, 2004

• объ (ob) (Pre-reform orthography (1918))
• о (o) – usually before consonants
• обо (obo) – before some words such as мне (mne) or все (vse)

From Proto-Slavic *o(b), from Proto-Indo-European *h₃ebʰi.

• IPA^(key): [ɐp] (before voiceless consonants)
• IPA^(key): [ɐb] (before vowels and voiced consonants)

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об • (ob)

1. (+ prepositional case) about, of, on

   Я узна́л мно́го об икре́ ― Ja uznál mnógo ob ikré ― I found out a lot about caviar.

2. (+ accusative case) against, upon

   опира́ться об окно́ ― opirátʹsja ob oknó ― to lean against the window

• The об form is usually unstressed. It is stressed in the idioms рука́ о́‎б ру́ку (ruká ó‎b rúku), как о́‎б стену горо́х (kak ó‎b stenu goróx). It can be stressed or unstressed in the word combination о́‎б пол (ó‎b pol) (об по́‎л (ob pó‎l)).
• When governing the prepositional case, об is used before vowels. However, both об and о can occur before the possessive pronoun их (ix).
• When governing the accusative case, об is used before vowels and variably before liquids in the written language. In the colloquial language, об is used before all words.

• IPA^(key): [ɔːb]

об • (ob)

1. water

• обӣ (obī)