FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

kanon κανών — kan-ohn' — from kane (a straight reed, i.e. rod); a rule ("canon"), i.e. (figuratively) a standard (of faith and practice); by implication, a boundary, i.e. (figuratively) a sphere (of activity):--line, rule.