Transannular is a term that refers to something crossing through or bridging across a ring or annular structure. There are a few synonyms that can be used to describe this phenomenon, such as intrabridging, across-the-ring, or cyclic conjugation. Other possible synonyms for transannular include interannular, bridging-over, and cycloconjugated. These terms all describe a similar concept of some sort of connection or interaction that occurs between different parts of a cyclic structure. Whether it's in the context of chemistry, physics, or some other scientific field, the use of synonyms can help to clarify technical language and make ideas more accessible to a wider audience.