Source : Webster's Revised Unabridged Dictionary (1913)

Reigle \Rei"gle\ (r?"g'l), n. [F. r[`e]gle a rule, fr. L.
   regula. See {Rule}.]
   A hollow cut or channel for quiding anything; as, the reigle
   of a side post for a flood gate. --Carew.

Reigle \Rei"gle\, v. t.
   To regulate; to govern. [Obs.]