The Collaborative International Dictionary of English v.0.48:

Hyracoidea \Hyr`a*coi"de*a\, n. pl. [NL. See Hyrax, and
   oid.] (Zool.)
   An order of small hoofed mammals, comprising the single
   living genus Hyrax.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Hyracoidea
    n 1: hyraxes and some extinct animals [syn: Hyracoidea, order
         Hyracoidea]