Definition of "cudweed"

Any of many of species of flowering plants in family Asteraceae of several genera:

1. Gamochaeta, with species in North and South America  examples

2. Gnaphalium, with species in Eurasia and the Americas  examples

3. Pseudognaphalium, native to North America  examples

4. Filago, of Eurasia and North America  examples

5. Euchiton, native to Australasia and the Pacific  examples

6. Helichrysum, occurring in Africa, Australasia and Eurasia.  examples

Antennaria dioica  examples

Cudbear, a fungus of species (Ochrolechia tartarea, syn. Lecanora tartarea)  examples