Definition of hardheads in English:

hardheads

Syllabification: hard·heads
Pronunciation: /ˈhärdˌhedz
 
/

noun

[treated as singular]
another term for knapweed, especially the black knapweed.

Definition of hardheads in:

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Word of the day setose
Pronunciation: ˈsēˌtōs
adjective
bearing bristles or setae; bristly