A form of hypersensitivity pneumonitis caused by exposure to bird droppings or feathers.

(dated, idiomatic, British slang) Any large, plentiful source or supplier of money.

plural of bird's nest soup

A Chinese delicacy made from edible bird's nests prized for its smooth texture and delicate flavor.

Alternative spelling of birdsfoot trefoil

plural of bird's-foot trefoil

plural of important bird area

(ornithology, conservation) A area recognised as requiring conservation and management due to its importance for the survival of bird species that are vulnerable to global extinction.

Synonym of bird fancier's lung

The ivory-billed woodpecker. / The pileated woodpecker (erroneously).