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

(computing) An informal discussion group, typically at a conference, based on a shared interest and without any fixed agenda.

(informal) Thoroughly happy.

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).

plural of Lord God bird

A kind of diaphragm cell.

plural of Hargreaves-Bird cell