1. 
   rectal thermometer
   a clinical thermometer that is inserted in the rectum.
   Found op http://www.encyclo.co.uk/local/21001
   
   
2. 
   Rectal Thermometer
   A thermometer that is used to take a temperature in the rectum. Obtaining a temperature reading in the rectum is the most accurate method for diagnosing a fever. When taking a rectal temperature, it is recommended to use a water-based lubricant to ease any discomfort.
   Found op http://www.pregnology.com/AZ/R/1
   
   

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