Ob definition

ŏb, ôb, ôp
Opposed to, against.

Obstinate.

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Obstetrician.
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A river, about 3,700 km (2,300 mi) long, of central Russia flowing generally northward to the Gulf of Ob, an arm of the Arctic Ocean.
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Obadiah.
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(place) Arm of the Kara Sea, in NW Siberia: c. 600 mi (966 km) long.
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(category theory) The set of objects of a category.
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(latin) Obiit (he or she died)
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(latin) Obiter (incidentally)
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Inverse; inversely.

Obcordate.

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(place) River in W Siberia, flowing from the Altai Mountains northwest & north into the Gulf of Ob: 2,495 mi (4,015 km)
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(bible) Obadiah.
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Obstetrician.
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Obstetrics.
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In passing; incidentally.
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To, toward, before, in front of.

Obtrude.

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Upon, over.

Obscure.

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Completely, totally.

Obdurate.

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Inversely, oppositely.

Obovoid.

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Obstetrician.
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Obstetric.
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Obstetrics.
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(historical) A halfpenny.
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(archaic) An objection.
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(genetics) The obese gene.
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A major river in western Siberia, Russia.
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Obstetric.
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Obstetrics.
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He (or she) died.
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Origin of ob

  • < L ob, toward, for, about, before < IE base *epi-, *opi-, near, at, toward, after > Gr epi

    From Webster's New World College Dictionary, 5th Edition

  • New Latin short for obversē obversely from Latin obversus past participle of obvertere to turn toward ob- toward, against (from ob toward, against, before epi in Indo-European roots) vertere to turn versus

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin ob, abbreviation of obulus.

    From Wiktionary