ob


From The Collaborative International Dictionary of English v.0.48:

Ob- \Ob-\ [L. ob, prep. Cf. Epi-.]
   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, or oppositely, ovate. Ob- is
   commonly assimilated before c, f, g, and p, to oc-, of-, og-,
   and op-.
   [1913 Webster]
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