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单词 difluan
释义

difluann.

Forms: 1800s diffluan, 1800s–1900s difluan.
Origin: A borrowing from German. Etymon: German Difluan.
Etymology: < German Difluan (A. Schlieper 1845, in Ann. der Chem. u. Pharm. 56 5; also Diffluan (1850 or earlier)) < classical Latin diffluere to flow away, dissolve (see diffluent adj.) + German -an -ane suffix2. N.E.D. (1895) gives the pronunciation as (di·fluæ̆n) /ˈdɪfluːæn/.
Chemistry. Obsolete.
A bitter-tasting deliquescent substance of uncertain identity obtained by heating alloxanic acid.The substance was later identified with allanturic acid (allanturic acid n. at allanturic adj.).
ΚΠ
1845 Lancet 20 Sept. 306/2 A loose powder is obtained, which becomes fluid directly when exposed to air, and thence its name. Difluan is easily dissolved in water.
1853 D. Breed tr. C. Löwig Princ. Org. & Physiol. Chem. 341 If the aqueous solution be heated above 60°, carbonic acid is evolved, whilst leucoturic acid and difluan are formed.
1855 H. Watts tr. L. Gmelin Hand-bk. Chem. IX. 448 Diffluan [Ger. Diffluan], in all its relations, appears to be identical with allanturic acid.
1921 Jrnl. Chem. Soc. 120 i. 816 It is shown to be decomposed by hot water into Schlieper's leucoturic acid, a second substance (see later), and difluan.
This entry has been updated (OED Third Edition, March 2016; most recently modified version published online September 2021).
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n.1845
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