The Collaborative International Dictionary of English v.0.48:

Maguey \Mag"uey\, n. [Sp. maguey, Mexican maguei and metl.]
   (Bot.)
   Any of several species of Agave, such as the century
   plant (Agave Americana), a plant requiring many years to
   come to maturity and blossoming only once before dying; and
   the Agave atrovirens, a Mexican plant used especially for
   making pulque, the source of the colorless Mexican liquor
   mescal; and the cantala (Agave cantala), a Philippine
   plant yielding a hard fibre used in making coarse twine. See
   Agave.
   [1913 Webster + WordNet 1.5]

   2. A hard fibre used in making coarse twine, derived from the
      Philippine Agave cantala (Agave cantala); also called
      cantala.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

maguey
    n 1: Mexican plant used especially for making pulque which is
         the source of the colorless Mexican liquor, mescal [syn:
         maguey, Agave atrovirens]
    2: Philippine plant yielding a hard fibre used in making coarse
       twine [syn: maguey, cantala, Agave cantala]