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carboxyl
From The Collaborative International Dictionary of English v.0.48:
Oxalyl \Ox"a*lyl\, n. [Oxalic + -yl.] (Chem.) (a) A hydrocarbon radical (C2O2) regarded as a residue of oxalic acid and occurring in derivatives of it. (b) An old name for carbonyl. (c) An old name for carboxyl. [1913 Webster] .
From The Collaborative International Dictionary of English v.0.48:
Carboxyl \Car*box"yl\ (k[aum]r*b[o^]ks"[i^]l), n. [Carbon + oxygen + -yl.] (Chem.) The complex radical, CO.OH, regarded as the essential and characteristic constituent which all oxygen acids of carbon (as formic, acetic, benzoic acids, etc.) have in common; -- called also oxatyl. [1913 Webster]
