A (usually rigid), flat, rectangular measuring or drawing device with graduations in units of measurement; a straightedge with markings.

(transitive) To beat with a ruler (as a traditional school punishment).

plural of ruler

plural of rulering

present participle of ruler

A spanking with a ruler.

simple past tense and past participle of ruler

(astronomy) Any astronomical object of known diameter whose distance can then be calculated from the angle it subtends

plural of standard ruler

One who favors or advocates home rule.