variant of (by assimilation) before p:
assimilated form of ob- before -p-.
1. out of print. 1. Order of Preachers (Dominican). 1. observation post. 2. British Theater. . 3. out of print. 4. . 1. observation post. abbreviation 1. out of print abbreviation 1. (military) observation post 2. Ordo Praedicatorum (the Dominicans) 3. organophosphate noun [fr operator or operative] adjective Other people’s: OP. Other people’s money [1901+; […]
U.S. Government. 1. Office of Price Administration: the federal agency (1941–46) charged with regulating rents and the distribution and prices of goods during World War II. 1. Office of Population Affairs 2. Orthopedic Practice Assembly
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[oh-pas-uh-fahy] /oʊˈpæs əˌfaɪ/ verb (used with object), opacified, opacifying. 1. to cause to become opaque. verb (used without object), opacified, opacifying. 2. to become opaque. opacification o·pac·i·fi·ca·tion (ō-pās’ə-fĭ-kā’shən) n.