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labyrinthodontia

Definition of labyrinthodontia:

part of speech: noun plural

One of the thirteen orders into which Professor Owen arranges the reptilia, living and extinct- so named from the complex structure of the teeth as seen in section.

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protractor

A math. instr. for laying down and measuring angles on paper that have been taken in the field; in anat., a muscle that draws forward any part; in surg., an instr. for drawing extraneous bodies out of a wound. ...

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