The Collaborative International Dictionary of English v.0.48:

Fescue \Fes"cue\ (f[e^]s"k[-u]), n. [OE. festu, OF. festu, F.
   f['e]tu, fr. L. festuca stalk, straw.]
   1. A straw, wire, stick, etc., used chiefly to point out
      letters to children when learning to read. "Pedantic
      fescue." --Sterne.
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            To come under the fescue of an imprimatur. --Milton.
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   2. An instrument for playing on the harp; a plectrum. [Obs.]
      --Chapman.
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   3. The style of a dial. [Obs.]
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   4. (Bot.) A grass of the genus Festuca.
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   Fescue grass (Bot.), a genus of grasses (Festuca)
      containing several species of importance in agriculture.
      Festuca ovina is sheep's fescue; F. elatior is
      meadow fescue.
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WordNet (r) 3.0 (2006):

fescue grass
    n 1: grass with wide flat leaves cultivated in Europe and
         America for permanent pasture and hay and for lawns [syn:
         fescue, fescue grass, meadow fescue, Festuca
         elatior]