PLUMB RULE

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

A plumb line attached to a narrow board

Classified under:

Nouns denoting man-made objects

Hypernyms ("plumb rule" is a kind of...):

perpendicular; plumb line (a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point)

Credits