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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]