OP
abbreviation
1.1
- observation post.
1.2
- (in the theatre) opposite prompt.（舞台上）同OPPOSITE PROMPT.
1.3
- organophosphate(s).同ORGANOPHOSPHATE或ORGANOPHOSPHATES.
1.4
- (in the Roman Catholic Church) Ordo Praedicatorum Order of Preachers (Dominican)（罗马天主教）布道兄弟会（多明我会）。