• (n.) A weed with a stem of many joints (Illecebrum verticillatum); also, the Polygonum aviculare or knotgrass.
Cen·tin'o·dy noun [ Latin centum a hundred + nodus knot: confer French centinode .] (Botany) A weed with a stem of many joints ( Illecebrum verticillatum ); also, the Polygonum aviculare or knotgrass.