1. 
   OEstruation
   OEs`tru·a'tion noun (Physiol.) The state of being under œstrual influence, or of having sexual desire.
   Found op http://www.encyclo.co.uk/webster/O/13
   
   
2. 
   oestruation
   <physiology> The state of being under oestrual influence, or of having sexual desire. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?oestruation
   
   
3. 
   Oestruation
   • (n.) The state of being under oestrual influence, or of having sexual desire.
   Found op http://thinkexist.com/dictionary/meaning/oestruation/
   
   

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