† ˈeyrarObs. Also 6 eyriar. [deriv. of eyrie= aerie: see aerie 2.] A brood (of swans). 1551Will C. Ferrers (Somerset Ho.), Eyriars of Swannes.1715Kersey, Eyrar (O.R.) an Eyrie or Nest of young Birds.1721–1800in Bailey.1847–78Halliwell, Eyrar, a brood of swans. Sometimes the bird itself.