A structured combination of one or more used to express a clinical idea.
- An expression containing a single is referred to as a . An expression that contains two or more is a .
- The in a are related to one another in accordance with rules expressed in the .
- These rules allow an expression to the meaning of a by applying more specific values to particular attributes of a more general .
284196006 |burn of skin|: 363698007 |finding site|= 33712006 |skin of hand|