1. 
   Of
   Oil filters.
   Found op http://grn.com/library/gloss.htm
   
   
2. 
   OF
   Overflow Flag
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   Of
   Of preposition [ Anglo-Saxon of of, from, off; akin to D. & Old Saxon af , German ab off, Old High German aba from, away, Icelandic , Dan., Swedish , & Goth. af , Latin ab , Greek ..., Sanskrit apa . C...
   Found op http://www.encyclo.co.uk/webster/O/13
   
   
4. 
   Of
   • (prep.) Denoting the agent, or person by whom, or thing by which, anything is, or is done; by. • (prep.) Denoting the material of which anything is composed, or that which it contains; as, a throne of gold; a sword of steel; a wreath of mist; a cup of water. • (prep.) In a general s...
   Found op http://thinkexist.com/dictionary/meaning/of/
   
   
5. 
   OF
   Oxidative-Fermentative
   Found op http://www.dyerlabs.com/glossary/microbiology/2w-x-y-z.html
   
   
6. 
   of
   1) '... course' 2) Coming from 3) Pertaining to 4) Word before course, sometimes
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/of/1
   
   

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