From The Collaborative International Dictionary of English v.0.48:

Glasswort \Glass"wort`\, n. (Bot.)
   A seashore plant of the Spinach family ({Salicornia
   herbacea}), with succulent jointed stems; also, a prickly
   plant of the same family (Salsola Kali), both formerly
   burned for the sake of the ashes, which yield soda for making
   glass and soap.
   [1913 Webster]
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