1. 1  any of several threadlike bodies, consisting of chromatin, that carry the genes in a linear order: the human species has 23 pairs, designated 1 to 22 in order of decreasing size and X and Y for the female and male sex chromosomes respectively.
data source name (DSN) A data source name (DSN) is a data structure that contains the information about a specific database that an Open Database Connectivity ( ODBC ) driver needs in order to connect to it.
User DSN: This is a DSN created for a specific user. Only the user who created the DSN can see this and use it. Like the System DSN, the information is stored in the Windows registry under the following key: HKEY_CURRENT_USER\Software\Odbc\Odbc.ini\Odbc Data sources.