noun
: an annual European weed ( Sherardia arvensis ) of the family Rubiaceae with square stems, whorled leaves, and heads of blue or pink flowers — called also blue field madder
noun
: an annual European weed ( Sherardia arvensis ) of the family Rubiaceae with square stems, whorled leaves, and heads of blue or pink flowers — called also blue field madder
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012