The word "drossier" is not commonly used in English, but it refers to something that is more full of waste material or impurities. The spelling of this word can be explained using IPA phonetic transcription. "Drossier" is spelled with an "ss" sound between two "o" vowels, indicating that the "o" sounds are pronounced separately. The ending "-ier" is pronounced as "ee-er," indicating that the stress falls on the final syllable.