G2583 κανών (kanṓn)

KJV renderings: line, rule
Strong's definition: a rule ("canon"), i.e. (figuratively) a standard (of faith and practice); by implication, a boundary, i.e. (figuratively) a sphere (of activity)
Derivation: from (a straight reed, i.e. rod);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.