bitter orange
US /ˈbɪt.ər ˈɔːr.ɪndʒ/
UK /ˈbɪt.ər ˈɔːr.ɪndʒ/

1.
naranja amarga, naranja agria
a citrus tree (Citrus × aurantium) that produces a sour, bitter fruit, often used for marmalade, liqueurs, and essential oils
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The peel of the bitter orange is used to make marmalade.
La cáscara de la naranja amarga se usa para hacer mermelada.
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Essential oil from bitter orange blossoms is called neroli.
El aceite esencial de las flores de naranja amarga se llama neroli.