coloured a greyish yellow

Of or related to Isabella I of Castile. / Of a style of Spanish Gothic architecture that flourished under Isabella I of Castile.

plural of isabelline shrike

Lanius isabellinus, a member of the shrike family (Laniidae). It was formerly considered conspecific with the red-tailed shrike and the red-backed shrike.

Oenanthe isabellina, an Old World flycatcher native to Asia