Definition of ob- in English:

ob-

prefix

1Denoting exposure or openness: obverse
2Denoting opposition, hostility, or resistance: opponent

Origin

from Latin ob 'towards, against, in the way of'.

Usage

Ob- occurs mainly in words of Latin origin; it is also found assimilated in the following forms: oc- before c; of- before f; op- before p.

Definition of ob- in:

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily