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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 pi·per·o·nal /paɪˈpɛrəˌnæl/
 胡椒醛; 向日葵素

From: Webster's Revised Unabridged Dictionary (1913)

 Pip·er·o·nal n. Chem. A white crystalline substance obtained by oxidation of piperic acid, and regarded as a complex aldehyde.