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Ptolemaic system
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pterygoid process

pter·y·goid proc·ess [ tèrrə goyd pró sèss ] (plural pter·y·goid proc·ess·es)


noun 
Definition:
 
bone of skull: either of two bony plates extending downward from the sphenoid bone of the skull

[< modern Latin pterygoides "like a wing" < Greek pterux "wing"]
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