The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Reigle \Rei"gle\, v. t.
   To regulate; to govern. [Obs.]
   [1913 Webster]