Diresidue

Diresidue is a term without a single, universally recognized meaning across disciplines. The combination of the prefix di- (two) with residue can yield different senses depending on the field, and in many contexts the word does not appear as a standard technical term.

In mathematics and number theory, residue commonly refers to a remainder modulo an integer or to a residue class. Some writers may use the informal term diresidue to indicate a pair or set of residues that share a particular property, but this usage is nonstandard and not reflected in major reference works. When encountered, it should be interpreted from the surrounding mathematical context.

In biochemistry and proteomics, a residue denotes an amino acid that remains within a peptide or protein after polymerization. If used, diresidue would typically be understood to mean two adjacent residues or a two-residue fragment, but the standard terminology for such a unit is a dipeptide or simply a two-residue segment rather than diresidue.

In other domains, diresidue may appear as a coined term, project name, or brand that carries no scientific meaning by itself. In such cases, its definition is entirely context-dependent and should be clarified by the author or source.

Etymology: the word combines the prefix di- (“two”) with residue, a term used in multiple scientific contexts.

See also: residue, dipeptide, quadratic residue, modular arithmetic.