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butyric acid
[butyric acid 词源字典]
"A colourless syrupy liquid organic acid found in rancid butter and in arnica oil", Mid 19th century:
butyric
from Latin
butyrum
(see
butter
) + -ic.
[butyric acid etymology, butyric acid origin, 英语词源]
[butyric acid 词源字典]