Definition of arch:

part of speech: adjective

Chief of the first class.

part of speech: verb

To cover with an arch; to form an arch.

part of speech: noun

The circular part of any building; the hollow or concave part of a bridge or gateway.

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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. ...