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The Collaborative International Dictionary
Limonin

Limonin \Li*mo"nin\ (l[-i]*m[=o]"n[i^]n), n. [From NL. Citrus Medica, var. Limonum, the scientific name of the lemon.] (Chem.) A bitter, white, crystalline substance found in orange and lemon seeds.

Wiktionary
limonin

n. (context chemistry English) A limonoid found in orange and lemon seeds.

Wikipedia
Limonin

Limonin is a limonoid, and a bitter, white, crystalline substance found in citrus and other plants. It is also known as limonoate D-ring-lactone and limonoic acid di-delta-lactone. Chemically, it is a member of the class of compounds known as furanolactones.