1.  ds(n = noun.substance) atomic number 110, darmstadtium, element 110 - a radioactive transuranic element;
is a kind of chemical element, element

2.  ds(n = noun.group) bureau of diplomatic security - the bureau in the State Department that is responsible for the security of diplomats and embassies overseas;
is a kind of agency, authority, bureau, federal agency, government agency, office
is a part of department of state, dos, state, state department, united states department of state

3.  ds(n = noun.communication) doctor of science, scd - an honorary degree in science;
is a kind of honorary degree, honoris causa

ds, abbr.
1 dal segno.
2 disseminated sclerosis.