The Collaborative International Dictionary of English v.0.48:

Fescue \Fes"cue\ (f[e^]s"k[-u]), v. i. & t. [imp. & p. p.
   Fescued; p. pr. & vb. n. Fescuing.]
   To use a fescue, or teach with a fescue. --Milton.
   [1913 Webster]