op

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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

opus.

observation post.

British Theater, opposite prompt.

Order of Preachers (Dominican). Origin:
< Latin Ōrdō Praedicātōrum.

out of print.

overproof.

out of print.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins

World English Dictionary

OP

—*abbreviation for*
1.	military observation post
2.	Ordo Praedicatorum (the Dominicans)
3.	organophosphate

[(for sense 2) Latin: Order of Preachers]

op.

—*abbreviation for*
1.	operation
2.	opus
3.	operator
4.	operational

o.p. or O.P.

—*abbreviation for*
	out of print

O.P. or O.P.

—*abbreviation for*

o.p. or O.P.

—*abbreviation for*
	out of print

O.P. or O.P.

—*abbreviation for*

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Slang Dictionary

/op/ n.
1. In England and Ireland, common verbal abbreviation for `operator', as in system operator. Less common in the U.S., where sysop seems to be preferred.
2. [IRC] Someone who is endowed with privileges on IRC, not limited to a particular channel. These are generally people who are in charge of the IRC server at their particular site. Sometimes used interchangeably with CHOP. Compare sysop.

Jargon
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FOLDOC

Computing Dictionary

op definition

job
/op/ 1. In England and Ireland, a common verbal abbreviation for "operator", as in system operator. This is less common in the US, where sysop seems to be preferred.
2. The general term for an IRC channel op. Also, as a verb: to give someone channel op privileges. Compare ircop.
[Jargon File]
(1997-12-12)

American Heritage

Abbreviations & Acronyms