A prefix designating compounds formed by heating a compound, usually with the @E02038@ of water, carbon dioxide, or other simple molecule, e.g. pyroglutamic acid from glutamic acid.
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1361 [Terms] [Paper]