Etymology
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Pap test (n.)

1963, short for Papanicolaou (1947) in reference to George Nicholas Papanicolaou (1883-1962), Greek-born U.S. anatomist who developed the technique of examining secreted cells to test for cancer.

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in vitro 

1892, scientific Latin; "in a test tube, culture dish, etc.;" literally "in glass," from Latin vitrum "glass" (see vitreous).

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