The spelling of the word "Aortra" may seem unusual, but it actually follows the rules of English phonetics. In IPA phonetic transcription, it is written as /eɪˈɔːtrə/, with the "a" pronounced as the "ay" sound and the "o" pronounced as the "aw" sound. The "r" in "aortra" is pronounced as a trilled or tapped sound. This word refers to the plural form of the aorta, the main artery in the human body that carries oxygen-rich blood from the heart to the rest of the body.