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.
An LDAP directory service is also referred to as a DSA. In Active Directory, servers that host DSAs are domain controllers. At the root of an LDAP directory tree is a DSE (the rootDSE), which is not part of any directory partition. TherootDSE represents the top of the logical namespace for one domain controller.