Source : Webster's Revised Unabridged Dictionary (1913)

Crinoline \Crin"o*line\ (kr?n"?-l?n), n. [F., fr. crin hair,L.
   crinis.]
   1. A kind of stiff cloth, used chiefly by women, for
      underskirts, to expand the gown worn over it; -- so called
      because originally made of hair.

   2. A lady's skirt made of any stiff material; latterly, a
      hoop skirt.

Source : WordNet®

crinoline
     n 1: a skirt stiffened with hoops [syn: {hoopskirt}]
     2: full stiff petticoat made of crinoline
     3: a stiff coarse fabric used to stiffen hats or clothing