petri-

variant of petro-1. before elements of Latin origin: petrifaction.
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Example sentences
Carr, whose conception in a petri dish was once so controversial, is content
  these days to be regarded as ordinary.
The study was preliminary and was conducted on unprotected cells in petri
  dishes, so it may not be relevant for humans.
To demonstrate the device, they used it to grasp and maneuver tiny beads and
  clumps of cells in a petri dish.
They were clustered in a little heap, after dividing in a petri dish for almost
  three weeks.
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