Decy

Decy is a term that appears in various, unrelated contexts but does not have a single, widely recognized definition in English. In onomastics, Decy can be used as a given name or surname in some cultures, though it is uncommon and not associated with a well-documented lineage or notable bearers in standard references.

In chemistry and naming practices, decyl or deca- are the conventional forms referring to ten carbon atoms. The sequence or fragment "decy-" is not a standard IUPAC prefix in contemporary nomenclature; when ten carbons are involved, the usual term is decyl. The form "decy" may occasionally appear in older texts or nonstandard spellings, but it is not the accepted form in modern chemical names.

As an acronym or label, DECY or similar variants may be used for specific, context-dependent purposes in projects, organizations, or datasets, but there is no universally accepted meaning attached to the term. Because usage is diverse and context-dependent, readers should supply additional information to identify the intended sense of "decy" in a given instance.

For related terms, see deca-, deci-, decyl, and decay.