Definition of à l'orange in English:
à l'orange
(also a l'orange)
adjective ˌa lɒˈrɒ̃ʒˌɑː lɒˈrɒ̃ʒ
Cookery Prepared or served with orange slices or peel, or with an orange-flavoured sauce. Frequently as postpositive in the names of dishes, especially in "duck à l'orange".
Origin
Early 19th century. From French à l'orange from à la + orange.