Source : Webster's Revised Unabridged Dictionary (1913)

Spearwort \Spear"wort`\, n. [AS. sperewyrt.] (Bot.)
   A name given to several species of crowfoot ({Ranunculus})
   which have spear-shaped leaves.

Ranunculus \Ra*nun`cu*lus\, n.; pl. E. {Ranunculuses}, L.
   {Ranunculi}. [L., a little frog, a medicinal plant, perhaps
   crowfoot, dim. of rana a frog; cf. raccare to roar.] (Bot.)
   A genus of herbs, mostly with yellow flowers, including
   crowfoot, buttercups, and the cultivated ranunculi ({R.
   Asiaticus}, {R. aconitifolius}, etc.) in which the flowers
   are double and of various colors.

Source : WordNet®

Ranunculus
     n : annual, biennial or perennial herbs: buttercup; crowfoot
         [syn: {genus Ranunculus}]