monoaldehyde
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semialdehyde — noun The monoaldehyde of a dicarboxylic acid; those of some amino acids are intermediates in biosynthesis … Wiktionary
semialdehyde — The monoaldehyde of a dicarboxylic acid, so called because half the COOH groups of the original acid are reduced to the aldehyde while the other half are unchanged; e.g., glutamic acid γ s., OHC–CH2CH2CH(NH3)+–COO−. Many semialdehydes are… … Medical dictionary