Source : Webster's Revised Unabridged Dictionary (1913)

Spiderwort \Spi"der*wort`\, n. (Bot.)
   An American endogenous plant ({Tradescantia Virginica}), with
   long linear leaves and ephemeral blue flowers. The name is
   sometimes extended to other species of the same genus.

Source : WordNet®

spiderwort
     n : any plant of the family Commelinaceae [syn: {dayflower}]