Source : Webster's Revised Unabridged Dictionary (1913)

Pearlwort \Pearl"wort`\, n. (Bot.)
   A name given to several species of {Sagina}, low and
   inconspicuous herbs of the Chickweed family.

Source : WordNet®

pearlwort
     n : any of various low-growing plants of the genus Sagina having
         small spherical flowers resembling pearls [syn: {pearlweed},
          {pearl-weed}]