Milkwort \Milk"wort`\, n. (Bot.) A genus of plants (Polygala) of many species. The common European P. vulgaris was supposed to have the power of producing a flow of milk in nurses.

Note: The species of Campanula, or bellflower, are sometimes called milkwort, from their juice.

Source: Webster's Revised Unabridged Dictionary (1913)