The word "annexa" is spelled with two "n"s and two "x"s. The first "n" is pronounced with an "æ" sound, the vowel sound in "cat." The first "x" is pronounced like a "ks" sound, while the second "x" is pronounced like a "gz" sound. The second "n" is pronounced like an "uh" sound. The IPA phonetic transcription for "annexa" is /æˈnɛksə/. It is important to understand pronunciation and spelling to communicate effectively in any language.
Appendages, parts accessory to the main organ or structure.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.