Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for ob- from the 1913 edition of Webster's Revised Unabridged Dictionary. Define ob- using one of the most comprehensive free online dictionaries on the web.

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ob-
Part of Speech: noun
Results: 1
1. A prefix signifying to, toward, before, against, reversely, etc.; also, as a simple intensive; as in oblige, to bind to; obstacle, something standing before; object, lit., to throw against; obovate, reversely, ovate. Ob- is commonly assimilated before c, f, g, and p, to oc-, of-, og-, and op-.
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