wild madder

noun

Definition of wild madder

1 : madder sense 1

2 : either of two bedstraws:

a : a European herb (Galium mollugo) that has ample panicles of small white flowers and is naturalized in North America

— called also infant's-breath, white bedstraw

b : an American herb (Galium tinctorium) with terminal flowers in clusters of two or three