What describes terms that are used in a particular field?

The correct choice describes terms that are used specifically within a particular field as a "specialized dictionary." This term refers to a reference work that compiles terminologies used in a specific area, often including technical terms, jargon, and phrases that may not be familiar to those outside the field. A specialized dictionary serves as an authoritative source for understanding the unique vocabulary and meanings pertinent to that discipline, ensuring clear communication among professionals in the field.

The other options represent different concepts. Common vocabulary refers to the everyday words and terms used by the general population, which may lack the specific nuances of specialized discussions. Informal language encompasses casual speech and slang that is generally not suitable for professional or academic contexts. Standard terms might imply widely accepted words within a field but don’t capture the comprehensive nature of a specialized dictionary that may include both common and rare terms specific to a certain discipline.