Taxodiaceae is a former classification of a family of coniferous trees, now included in the family Cupressaceae. It was previously used to describe a group of mostly extinct and a few living species of trees that share similarities with the redwoods (Sequoioideae). The name "Taxodiaceae" is still sometimes used in a broader sense to refer to this group, but it is not considered a valid taxonomic classification under modern systems.

The family Taxodiaceae was traditionally defined to include several genera of conifers, including:

* *Cryptomeria* (Japanese cedar)
* *Glyptostrobus* (Chinese swamp cypress)
* *Metasequoia* (Dawn redwood)
* *Sequoia* (Coast redwood)
* *Sequoiadendron* (Giant sequoia or Sierra redwood)
* *Taiwania* (Taiwan red cypress)
* *Taxodium* (Bald cypress and Pond cypress)

However, modern molecular studies have shown that these genera are not as closely related to each other as previously thought. As a result, they have been reclassified into different subfamilies within the family Cupressaceae.

Therefore, there is no medical definition of 'Taxodiaceae' as it does not refer to any specific medical condition or treatment.