a woodworker's square with an adjustable arm that can be set to mark out an angle or to check the slope of a surface
bevel square in American English
noun
an adjustable tool used by woodworkers for laying out angles and for testing the accuracy of surfaces worked to a slope
Word origin
[1605–15]This word is first recorded in the period 1605–15. Other words that entered Englishat around the same time include: ferrule, gothic, inverse, series, turnover