The Collaborative International Dictionary of English v.0.48:

Freak \Freak\ (fr[=e]k), v. t. [imp. & p. p. Freaked
   (fr[=e]kt); p. pr. & vb. n. Freaking.] [Akin to OE. frakin,
   freken, freckle, Icel. freknur, pl., Sw. fr[aum]kne, Dan.
   fregne, Gr. perkno`s dark-colored, Skr. p[.r][,c]ni
   variegated. Cf. Freckle, Freck.]
   To variegate; to checker; to streak. [R.]
   [1913 Webster]

         Freaked with many a mingled hue.         --Thomson.
   [1913 Webster]