op-

prefix assim. form of OB- before p.

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var. of ob- (by assimilation) before p: oppose.

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op or Op «op», adjective, noun.

–adj.

having to do with op art.

–n.

= op art.

╂[< op art]

op-,

prefix. the form of ob- (Cf. ↑ob-) before p, as in oppress.

op.,

1. opera.

2. operation.

3. opposite.

4. opus.

o.p. or O.P.,

1. out of print.

2. overprint (on a stamp).

3. overproof.

OP (no periods) or O.P.,

observation post.

O.P.,

(among Dominicans) Order of Preachers (Latin, Ordo Praedicatorum).

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suffix

1) variant spelling of ob-

2) assimilated before p (as in oppress, oppugn)

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op-

the form of the L. prefix ob- before p, as oppilate, oppose, oppress, oppugn. (Only one p is pronounced in Eng.)