I've always heard coplin, to rime with poplin or Janis Joplin.
 
 I checked some references, including the venerable "The Microtomist's Vade-Mecum" and my daddy's 1920 Dorland medical dictionary, as well as Google, and found nothing about who Coplin was.
 
 So the thing is called a "cuvette" - variously spelled - in Germany and the Netherlands? That would be fairly close the the English use of that curious word - a square glass spectrophotometer cell with optically flat sides. 
 
 Apparently the word originally meant a bowl, and gradually acquired the meaning of a bowl-like container with square sides. It went in a different direction in French, where it came to mean a toilet bowl.
 
 Bob Richmond
 Samurai Pathologist
 Knoxville TN
 
 
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