The word "Mersera" is spelled as /mɛrsɛrə/. In this spelling, the "e" in the first syllable represents the short "e" sound, the "rs" combination in the second syllable creates an "er" sound, and the final "a" represents the schwa sound. The use of IPA phonetic transcription allows for a clear and accurate representation of the sounds in this word, aiding in proper pronunciation.