Definition of German knotgrass in English:

German knotgrass

noun

rare
  • Knawel, Scleranthus annuus, a creeping plant with pairs of small pointed leaves and inconspicuous green flowers, native to Eurasia and North Africa but common as a weed in many temperate areas.

Origin

Late 17th century; earliest use found in John Ray (1627–1705), naturalist and theologian.