This glossary is intended to facilitate communication within the Food and Drug Administration (FDA) on the subject of pesticide residues in foods and feeds. It serves as the source of names chosen for use in all agency documents and internal communications. Chemicals are listed, alphabetically by preferred name, in the body of the glossary. The preferred name is printed in bold-face type, as is the CAS Registry number assigned by Chemical Abstracts Service (not available for some entries). Alternate names are identified by type of name. An index provides a cross-reference to the preferred name for each alternate name.