The spelling of the word "lucier" can be explained using the International Phonetic Alphabet (IPA). The first syllable is pronounced as "lu" with the IPA transcription of /lu/. The second syllable is pronounced as "see" with the IPA transcription of /si/. And the final syllable is pronounced as "er" with the IPA transcription of /ɚ/. Therefore, the correct spelling of this word would be "lucier" with the phonetic transcription of /luːsiɚ/. It is important to use the correct spelling and transcription of words to ensure effective communication.