Definition of hardbill in US English:

hardbill

adjective

Ornithology
  • = hard-billed.

noun

Ornithology
  • Originally: †a grosbeak or similar finch (obsolete). In later use: (especially in aviculture) any bird, especially a finch or similar songbird, that has a bill adapted for feeding on hard foods such as seeds and grain. Contrasted with softbill.

Origin

Late 18th century. From hard + bill.

Pronunciation

hardbill

/ˈhɑːdbɪl/