Used in two senses:
The term <term> part of an item in a two-part (definition) list may be a term, a word, a phrase, a picture or icon, an equation, a variable, or anything else that is to be explained. The definition <def> part of an item in a two-part (definition) list need not be a “definition” in the strict dictionary sense of that word. Such a definition could be a discussion, explanation, expansion, or just a few words that tell the reader about the <term>. When a <def-list> is within a <glossary> element, the definitions are assumed to be real definitions.
<!ELEMENT def %def-model; >
... <back> <glossary id="bid.1237"> <title>Glossary</title> <def-list> <def-item> <term id="bid.1238">3-D or 3D</term> <def> <p>Three-dimensional.</p> </def> </def-item> <def-item> <term id="bid.1722">Accession number</term> <def> <p>An Accession number is a unique identifier given to a sequence when it is submitted to one of the DNA repositories (GenBank, EMBL, DDBJ). The initial deposition of a sequence record is referred to as version 1. If the sequence is updated, the version number is incremented, but the Accession number will remain constant.</p> </def> </def-item> ... </def-list> </glossary> </back> ...