The Collaborative International Dictionary of English v.0.48:

Screak \Screak\ (skr[=e]k), v. i. [imp. & p. p. Screaked
   (skr[=e]kt); p. pr. & vb. n. Screaking.] [Cf. Icel.
   skraekja to screech. Cf. Creak, v., Screech.]
   To utter suddenly a sharp, shrill sound; to screech; to
   creak, as a door or wheel.
   [1913 Webster]