ruler

Từ điển American Heritage Dictionary 4th

rul·er (ro͞oʹlər)n.
1. One, such as a monarch or dictator, that rules or governs.
2. A straightedged strip, as of wood or metal, for drawing straight lines and measuring lengths. Also called rule.

• Từ đồng nghĩa / Synonyms:
  rule, swayer