"Ecardinal" is a made-up word with no official spelling or pronunciation. However, using IPA (International Phonetic Alphabet), we can break down the word into its component sounds. "E" would be pronounced as /iː/, "car" as /kɑr/, and "dinal" as /ˈdɑɪnəl/. Therefore, a possible spelling of this word could be "i-kar-dinal" or "ee-kar-dinal". Keep in mind that this is simply an educated guess and there is no set spelling for a non-existent word.